Gemechis File Duressa

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Gemechis File Duressa

Professor

Mathemtices Department

T itle: Prof. Dr.

Full Name:  Gemechis File Duressa

Nationality: Ethiopian

Academic Rank: Professor

College/institute: College of Natural Sciences

Department: Mathematics

Field of specialization: Mathematics (Numerical Analysis)

Research interest: Broadly focuses on Numerical Solution of Differential Difference Equations with Delay as well as Advance; Finite Difference Methods, Finite Element Methods, Fitted Operator and Fitted Mesh Methods for Solving Singularly Perturbed Boundary Value Problem in ODE’s and PDE’s; and Leadership in Higher Education

Publications:

  1. Deressa CT, Duressa GF, Investigation of the dynamics of COVID-19 with SEIHR nonsingular and nonlocal kernel fractional model. International Journal of Modelling and Simulation. 2021 Dec 27:1-20.  DOI: 10.1080/02286203.2021.2012636 

  2. Wakjira Tolassa Gobena and Gemechis File Duressa, Parameter-uniform numerical scheme for singularly perturbed delay parabolic reaction diffusion equations with integral boundary condition. International Journal of Differential Equations. Volume 2021, Article ID 9993644, 16 pages; https://doi.org/10.1155/2021/9993644.

  3. Masho Jima Kabeto and Gemechis File Duressa, Accelerated nonstandard finite difference method for singularly perturbed Burger‑Huxley equations. BMC Research Notes. 14(2021)446; https://doi.org/10.1186/s13104-021-05858-4.

  4. Tesfaye Aga Bullo, Guy Aymard Degla and Gemechis File Duressa, Fitted mesh method for singularly perturbed parabolic problems with an interior layer. Mathematics and Computers in Simulation. 193 (2022) 371–384. https://doi.org/10.1016/j.matcom.2021.10.029.

  5. Gemechis File Duressa and Habtamu Garoma Debela, Numerical solution of singularly perturbed differential-difference equations with mixed parameters. Journal of Mathematical Modeling. 9(4) (2021) 691-705.; DOI: 10.22124/jmm.2021.18365.1576.

  6. Mesfin Mekuria Woldaregay and Gemechis File Duressa, Uniformly Convergent Numerical Scheme for Singularly Perturbed Parabolic PDEs with Shift Parameters. Mathematical Problems in Engineering. Volume 2021, (2021) Article ID 6637661, 15 pages; https://doi.org/10.1155/2021/6637661.

  7. Mesfin Mekuria Woldaregay and Gemechis File Duressa, Uniformly convergent numerical scheme for singularly perturbed parabolic delay differential equations. J. Appl. Math. & Informatics. 39(5-6) (2021) 623-641; https://doi.org/10.14317/jami.2021.623.

  8. Imiru Takele Daba, Gemechis File Duressa, Uniformly convergent numerical scheme for a singularly perturbed differential-difference equation arising in computational neuroscience. J. Appl. Math. & Informatics. 39(5-6) (2021) 655 – 676; https://doi.org/10.14317/jami.2021.655.

  9. Worku Tilahun Anilay, Gemechis File Duressa and Mesfin Mekuria Woldaregay, Higher order uniformly convergent numerical scheme for singularly perturbed reaction-diffusion problems, KYUNGPOOK Math. J. 61(2021), 591-612; https://doi.org/10.5666/KMJ.2021.61.3.591.

  10. Habtamu Garoma Debela and Gemechis File Duressa, Uniformly convergent non-polynomial spline method for singularly perturbed robin-type boundary value problems with discontinuous source term, Abstract and Applied Analysis, Volume 2021, Article ID 7569209, 12 pages; https://doi.org/10.1155/2021/7569209.

  11. Tesfaye Aga Bullo, Guy Aymard Degla and Gemechis File Duressa, A parameter-uniform finite difference scheme for singularly perturbed parabolic problem with two small parameters, European Journal of Computational Mechanics, Vol. 30, 2–3(2021) 197–222; https://doi: 10.13052/ejcm2642-2085.30233.

  12. Mesfin Mekuria Woldaregay and Gemechis File Duressa, Accurate numerical scheme for singularly perturbed parabolic delay differential equation, BMC Research Notes, (2021) 14:358; https://doi.org/10.1186/s13104-021-05769-4.

  13. Imiru Takele Daba and Gemechis File Duressa, Collocation method using artificial viscosity for time dependent singularly perturbed differential-difference equations, Mathematics and Computers in Simulation, 192 (2022) 201–220;

https://doi.org/10.1016/j.matcom.2021.09.005.

  1. Mesfin Mekuria Woldaregay and Gemechis File Duressa, Uniformly convergent hybrid numerical method for singularly perturbed delay convection-diffusion problems, International Journal of Differential Equations, Volume 2021, Article ID 6654495, 20 pages; https://doi.org/10.1155/2021/6654495.

  2. Mesfin Mekuria Woldaregay and Gemechis File Duressa, Almost second-order uniformly convergent numerical method for singularly perturbed convection-diffusion-reaction equations with delay, APPLICABLE ANALYSIS, 100(2021) https://doi.org/10.1080/00036811.2021.1961756.

  3. Naol Tufa Negero and Gemechis File Duressa, A method of line with improved accuracy for singularly perturbed parabolic convection-diffusion problems with large temporal lag, Results in Applied Mathematics, 11 (2021) 100174; https://doi.org/10.1016/j.rinam.2021.100174.

  4. Tesfaye Aga Bullo, Guy Aymard Degla, and Gemechis File Duressa, Parameter-uniform finite difference method for singularly perturbed parabolic problem with two small parameters, International Journal for Computational Methods in Engineering Science and Mechanics; https://doi.org/10.1080/15502287.2021.1948148.

  5. Imiru Takele Daba and Gemechis File Duressa, A hybrid numerical scheme for singularly perturbed parabolic differential-difference equations arising in the modeling of neuronal variability, Comp and Math Methods, (2021), e1178; https://doi.org/10.1002/cmm4.1178.

  6. Gemechis File Duressa, Novel approach to solve singularly perturbed boundary value problems with negative shift parameter, Heliyon, 7(2021) e07497; https://doi.org/10.1016/j.heliyon.2021.e07497.

  7. Meku Ayalew, Gashu Gadisa Kiltu and Gemechis File Duressa, Fitted numerical scheme for second order singularly perturbed differential-difference equations with mixed shifts, Abstract and Applied Analysis, (2021) Volume 2021, Article ID 4573847, 11 pages; https://doi.org/10.1155/2021/4573847.

  8. Bediru Mustefa Abagero, Gemechis File Duressa and Habtamu Garoma Debela, Singularly perturbed robin type boundary value problems with discontinuous source term in geophysical fluid dynamics, Iranian Journal of Numerical Analysis and Optimization, Vol. 11, No. 2, (2021),351-364; DOI:10.22067/ijnao.2021.70376.1033.

  9. Mesfin Mekuria Woldaregay and Gemechis File Duressa, Robust mid-point upwind scheme for singularly perturbed delay differential equations, Computational and Applied Mathematics, (2021) 40:178; https://doi.org/10.1007/s40314-021-01569-5.

  10. Mesfin Mekuria Woldaregay and Gemechis File Duressa, Exponentially fitted tension spline method for singularly perturbed differential difference equations, Iranian Journal of Numerical Analysis and Optimization, Vol. 11, No. 2, (2021), 261-282; https://10.22067/ijnao.2021.68227.1009.

  11. Imiru Takele Daba and Gemechis File Duressa, Hybrid Algorithm for singularly perturbed delay parabolic partial differential equations, Applications and Applied Mathematics: An International Journal (AAM), 16(1) (2021) 397–416.

  12. Mesfin Mekuria Woldaregay and Gemechis File Duressa, Robust numerical method for singularly perturbed parabolic differential equations with negative shifts, FILOMAT, 35(7) (2021) 2383–2401; https://doi.org/10.2298/FIL2107383W.

  13. Masho Jima Kabeto and Gemechis File Duressa, Robust numerical method for singularly perturbed semilinear parabolic differential difference equations, Mathematics and Computers in Simulation 188 (2021) 537–547; https://doi.org/10.1016/j.matcom.2021.05.005.

  14. Merga Amara Angasu, Gemechis File Duressa and Mesfin Mekuria Woldaregay, Exponentially fitted numerical scheme for singularly perturbed differential equations involving small delays, Journal of Applied Mathematics and Informatics, 39(3-4) (2021), 419 – 435; https://doi.org/10.14317/jami.2021.419.

  15. Worku Tilahun Anilay, Gemechis File Duressa and Mesfin Mekuria Woldaregay, Higher order uniformly convergent numerical scheme for singularly perturbed reaction-diffusion problems, KYUNGPOOK Math. J., (2021) 61(3):591-612.

  16. Tesfaye Aga Bullo, Guy Aymard Degla and Gemechis File Duressa, uniformly convergent higher-order finite difference scheme for singularly perturbed parabolic problems with non-smooth data, Journal of Applied Mathematics and Computational Mechanics 20(1) (2021) 5-16; https://doi.org/10.17512/jamcm.2021.1.01.

  17. Mesfin Mekuria Woldaregay and Gemechis File Duressa, Robust numerical scheme for solving singularly perturbed differential equations involving small delays, Applied Mathematics E-Notes, 21(2020) 622-633.

  18. Tesfaye Aga Bullo, Gemechis File Duressa and Guy Aymard Degla, Accelerated fitted operator finite difference method for singularly perturbed parabolic reaction-diffusion problems, Computational Methods for Differential Equations, 9(3) (2021) 886-898;

https://doi.org/10.22034/cmde.2020.39685.1737.

  1. Mesfin Mekuria Woldaregay and Gemechis File Duressa, Fitted Numerical Scheme for Solving Singularly Perturbed Parabolic Delay Partial Differential Equations, Tamkang Journal of Mathematics, 53(2021); https://doi.org/10.5556/j.tkjm.53.2022.3638.

  2. Gashu Gadisa Kiltu, Gemechis File Duressa and Tesfaye Aga Bullo, Computational method for singularly perturbed delay differential equations of the reaction-diffusion type with negative shift, Journal of Ocean Engineering and Science, 6(3) (2021) 285–291; https://doi.org/10.1016/j.joes.2021.02.001.

  3. Chernet Tuge Deressa and Gemechis File Duressa, Analysis of Atangana–Baleanu fractional-order SEAIR epidemic model with optimal control, Advances in Difference Equations (2021) 2021:174 https://doi.org/10.1186/s13662-021-03334-8.

  4. Fasika Wondimu Gelu and Gemechis File Duressa, Uniformly convergent collocation method for singularly perturbed delay parabolic reaction-diffusion problem, Abstract and Applied Analysis, (2021) Volume 2021, Article ID 8835595, 11 pages https://doi.org/10.1155/2021/8835595.

  5. Mesfin Mekuria Woldaregay, Worku Tilahun Anilay and Gemechis File Duressa, Novel numerical scheme for singularly perturbed time delay convection-diffusion equation, Advances in Mathematical Physics, Volume 2021, Article ID 6641236, 13 pages https://doi.org/10.1155/2021/6641236.

  6. Imiru Takele Daba and Gemechis File Duressa, Extended B-spline collocation method for singularly perturbed parabolic differential-difference equation arising in computational neuroscience, International Journal for Numerical Methods in Biomedical Engineering, 37(2) (2021) e3418, 1-20; https://doi.org/10.1002/cnm.3418.

  7. Tariku Birabasa Mekonnen and Gemechis File Duressa, Uniformly convergent numerical method for two-parametric singularly perturbed parabolic convection-diffusion problems, Journal of Applied and Computational Mechanics 7(2) (2021) 535-545.

  8. Mesfin Mekuria Woldaregay and Gemechis File Duressa, Higher order uniformly convergent numerical scheme for singularly perturbed differential difference equations with mixed small shifts, International Journal of Differential Equations, Volume 2020, Article ID 6661592, 15 pages.

  9. Chernet Tuge Deressa and Gemechis File Duressa, Optimal control and sensitivity analysis for transmission dynamics of coronavirus, Results in Physics, 19 (2020) 103642.

  10. Chernet Tuge Deressa and Gemechis File Duressa, Modeling and optimal control analysis of transmission dynamics of COVID-19: the case of Ethiopia, Alexandria Engineering Journal, 60 (2021), 719–732.

  11. Habtamu Garoma Debela and Gemechis File Duressa, Fitted operator finite difference method for singularly perturbed differential equations with integral boundary condition, Kragujevac Journal of Mathematics 47(4) (2023), 637–651.

  12. Yohannis Alemayehu Wakjira and Gemechis File Duressa, Exponential Spline method for solving singularly perturbed third order boundary value problems, Demonstratio Mathematica 53 (2020) 360–372.

  13. Tariku Birabasa Mekonnen and Gemechis File Duressa, computational method for singularly perturbed two-parameter parabolic convection-diffusion problems, Cogent Mathematics & Statistics, 7 (2020), 1829277.

  14. Tesfaye Aga Bullo, Gemechis File Duressa and Guy Aymard Degla, Robust finite difference method for singularly perturbed two parameter parabolic convection-diffusion problems, International Journal of Computational Methods 18(2) 2050034 (2021), https://doi.org/10.1142/S0219876220500346.

  15. Habtamu Garoma Debela and Gemechis File Duressa, Uniformly convergent numerical method for singularly perturbed convection-diffusion type problems with nonlocal boundary condition, International Journal for Numerical Methods in Fluids, 92(2020), 1914–1926. https://doi.org/10.1002/fld.4854.

  16. Derartu Ayansa Turuna, Mesfin Mekuria Woldaregay and Gemechis File Duressa, Uniformly convergent numerical method for singularly perturbed convection-diffusion problems, KYUNGPOOK Math. J. 60(2020), 629-645.

  17. Murad H. Salih, Gemechis File Duressa, Habtamu Garoma Debela, Numerical solution of singularly perturbed self-adjoint boundary value problem using Galerkin method, International Journal of Engineering, Science and Technology, (2020) 12(3): 26-37.

  18. Dula Ayele Gurmessa, Gemechis File Duressa and Gashu Gadisa Kiltu, Fitted non-polynomial cubic spline method for singularly perturbed delay convection-diffusion equations, SINET: Ethiop. J. Sci. (2017) 40(1): 1-8.

  19. Gashu Gadisa Kiltu, Gemechis File Duressa and Tesfaye Aga Bullo, Numerical treatment of singularly perturbed delay reaction-diffusion Equations, International Journal of Engineering, Science and Technology, (2020) 12(1): 15-24.

  20. Habtamu Garoma Debela and Gemechis File Duressa, Accelerated fitted operator finite difference method for singularly perturbed delay differential equations with non-local boundary condition, Journal of the Egyptian Mathematical Society (2020) 28:16, https://doi.org/10.1186/s42787-020-00076-6.

  21. Habtamu Garoma Debela and Gemechis File Duressa, Accelerated exponentially fitted operator method for singularly perturbed problems with integral boundary condition, International Journal of Differential Equations, Volume 2020, Article ID 9268181, 8 pages: https://doi.org/10.1155/2020/9268181.

  22. Gemechis File Duressa, Gashu Gadisa Kiltu, Tesfaye Aga Bullo and Aynalem Girma Kassaye, Non-polynomial spline method for solving nonlinear two point boundary value problems, Ethiop. J. Educ. & Sc. 15(1) (2019) 42-59.

  23. Muslima Kedir Siraj, Gemechis File Duressa & Tesfaye Aga Bullo, Fourth-order stable central difference with Richardson extrapolation method for second-order self-adjoint singularly perturbed boundary value problems, Journal of the Egyptian Mathematical Society (2019) 27:50, https://doi.org/10.1186/s42787-019-0047-4.

  24. Habtamu Garoma Debela & Gemechis File Duressa, Exponentially fitted finite difference method for singularly perturbed delay differential equations with integral boundary condition, Int J Eng Appl Sci 11(4) (2019) 476-493, http://dx.doi.org/10.24107/ijeas.647640.

  25. Tesfaye Aga Bullo, Gemechis File Duressa & Guy Degla, Higher order fitted operator finite difference method for two-parameter parabolic convection-diffusion problems, Int J Eng Appl Sci, 11(4) (2019) 455-467, http://dx.doi.org/10.24107/ijeas.644160.

  26. Tesfaye Aga Bullo, Gemechis File Duressa & Guy Degla, Fitted operator average finite difference method for solving singularly perturbed parabolic convection-diffusion problems, Int J Eng Appl Sci, 11(3) (2019), 414-427. http://dx.doi.org/10.24107/ijeas.567374.

  27. Mesfin Mekuria Woldaregay and Gemechis File Duressa, Uniformly convergent numerical method for singularly perturbed delay parabolic differential equations arising in computational neuroscience, Kragujevac Journal of Mathematics, 46:1 (2022), 65–84.

  28. Mesfin Mekuria Woldaregay and Gemechis File Duressa, Parameter uniform numerical method for singularly perturbed parabolic differential difference equations, Journal of the Nigerian Mathematical Society, 38:2, (2019) 223-245.

  29. Teklu Tafesse Olkaba, Adula Bekele Hunde, Tadesse Regassa Mamo, Gemechis File Duressa and Dereje Daksa Keno, Analysis of the teacher training system in Ethiopia with specific reference to areas for improvement, Mekerere Journal of Higher Education, 10:2 (2019) 157–170; https://ajol.info/majohe.

  30. Aynalem Tafere Chekole, Gemechis File Duressa and Gashu Gadisa Kiltu, Non-polynomial septic spline method for singularly perturbed two point boundary value problems of order three, Journal of Taibah University for Science, 13:1 (2019) 651–660; https://doi.org/10.1080/16583655.2019.1617986.

  31. Gashu Gadisa Kiltu and Gemechis File Duressa, Accurate numerical method for Liénard nonlinear differential equations, Journal of Taibah University for Science, 13:1 (2019) 740-745; https://doi.org/10.1080/16583655.2019.1628627.

  32. Gashu Gadisa and Gemechis File, Fitted fourth order scheme for singularly perturbed delay convection-diffusion equations, Ethiopian Journal of Education and Sciences, 14:2 (2019) 102-118.

  33. Tadele Dugassa, Gemechis File & Tesfaye Aga, Stable numerical method for singularly perturbed boundary value problems with two small parameters, Ethiopian Journal of Education and Sciences, 14:2 (2019) 9-27.

  34. Tadesse Regassa, Adula Bekele, Gemechis File, Teklu Tafesse, and Dereje Daksa, A look in to leadership and leadership development practices in Ethiopia: A stakeholder analysis, International Journal of Multidisciplinary Research and Development, 6: 3 (2019) 40-44.

  35. Muluneh Dingeta, Gemechis File & Tesfaye Aga, Numerical solution of second order one dimensional linear hyperbolic telegraph equation. Ethiopian Journal of Education and Sciences, 14:1 (2018) 39-52.

  36. Feyisa Edosa & Gemechis File, higher order compact finite difference method for singularly perturbed one dimensional reaction diffusion problems. Journal of the Nigerian Mathematical Society, 36:3 (2017) 491-502.

  37. Yohannis A, Gemechis F. & Tesfaye A., Quintic Non-polynomial spline methods for third order singularly perturbed boundary value problems, Journal of King Saud University – Science, 30 (2018) 131-137, http://dx.doi.org/10.1016/j.jksus.2017.01.008.

  38. Gashu G, Gemechis F. & Tesfaye A., Fourth Order Numerical Method for Singularly Perturbed Delay Differential Equations, International Journal of Applied Sciences and Engineering 15(1) (2018) 17-32.

  39. Yitbarek Z, Gemechis F. & Tesfaye A., Sixth order stable central difference method for self-adjoint singularly perturbed two-point boundary value problems, Ethiopian Journal of Education and Sciences, 13(1) (2017) 23-41.

  40. Fasika Wondimu, Gemechis File & Tesfaye Aga, Sixth order compact finite difference method for singularly perturbed 1D reaction diffusion problems, Journal of Taibah University for Science, 11(2) March (2017) 302-308.

  41. Gemechis File, Gashu Gadisa, Tesfaye Aga & Y. N. Reddy, Numerical solution of singularly perturbed delay reaction-diffusion equations with layer or oscillatory behaviour, American Journal of Numerical Analysis, 5(1) (2017) 1-10.

  42. Gemechis File, Tesfaye Aga & Gashu Gadisa, Fourth order compact finite difference method for solving one dimensional wave equation, International Journal of Engineering & Applied Sciences (IJEAS), 8(4) (2016), 30-39.

  43. Gemechis File & Tesfaye Aga, Numerical Solution of Quadratic Riccati Differential equations, Egyptian Journal of Basic and Applied Sciences, 3(4) (2016) 392-397, http://dx.doi.org/10.1016/j.ejbas.2016.08.006.

  44. Fasika Wondimu, Gemechis File & Tesfaye Aga, Tenth Order Compact Finite Difference Method for Solving Singularly Perturbed 1D Reaction-Diffusion Equations, International Journal of Engineering & Applied Sciences (IJEAS), 8:3 (2016) 15-24.

  45. Fasika Wondimu, Gemechis File & Tesfaye Aga, Fourth Order Compact Finite Difference Method for Solving Singularly Perturbed 1D Reaction Diffusion Equations with Dirichlet Boundary Conditions, Momona Ethiopian Journal of Science, 8:2 (2016) 168-181.

  46. Terefe Asrat, Gemechis File & Tesfaye Aga, Fourth Order Stable Central Difference Method for Self-Adjoint Singular Perturbation Problems, The Ethiopian Journal of Science and Technology, 9:1 (2016) 53–68.

  47. Gemechis File, Awoke Andargie & Reddy Y. N., Fitted-Stable Finite Difference Method for Singularly Perturbed Two Point Boundary Value Problems, Ethiopian Journal of Education and Sciences, 11:1 (2015) 61-76.

  48. Gemechis File & Y. N Reddy, Domain Decomposition Method for Singularly Perturbed Differential Difference Equations with Layer Behaviour, International Journal of Engineering & Applied Sciences (IJEAS), 7: 1(2015) 86-102.

  49. Gemechis File & Y. N Reddy, Terminal Boundary Value Technique for Solving Singularly Perturbed Delay Differential Equations, Journal of Taibah University for Science, 8:3 (2014) 289–300.

  50. Gemechis File & Y. N Reddy, A Non-Asymptotic Method for Singularly Perturbed Delay Differential Equations, Journal of Applied Mathematics and Informatics, 32:1-2(2014) 39-53.

  51. Gemechis File & Y. N Reddy, Domain Decomposition Method for Solving Singular Perturbation Problems, International Journal of Applied Science and Engineering, 11:4 (2013) 433-448.

  52. Gemechis File & Y. N Reddy, Computational Method for Solving Singularly Perturbed Delay Differential Equations with Negative Shift, International Journal of Applied Science and Engineering, 11:1 (2013) 101-113.

  53. Gemechis File. & Y. N Reddy, Fitted-Modified Upwind Finite Difference Method for Solving Singularly Perturbed Differential Difference Equations, International Journal of Mathematical Models and Methods in Applied Sciences, 6:7 (2012) 791-802.

  54. Gemechis File & Y. N Reddy, Numerical Integration Method for Singularly Perturbed Differential-Difference Equations, International Review of Automatic Control: Theory and Application, 5:6 (2012) 868-876.

  55. Gemechis File & Y. N Reddy, Numerical Integration of a Class of Singularly Perturbed Delay Differential Equations with Small Shift, International Journal of Differential Equations, Volume 2012, Article ID 572723, doi:10.1155/2012/572723.

  56. Gemechis File & Y. N Reddy, Fitted-Stable central Difference Method for Solving Singularly Perturbed Delay Differential Equations, International Journal of Mathematical Science & Engineering Applications, 6:6 (2012) 271-290.

  57. Gemechis File & Ayalew Shibeshi, Instructors’ Perception of the Leadership Styles of Their Department Heads at Jimma University, The Ethiopian Journal of Education, 32:1 (2012) 93-122.

  58. Gemechis File & Ayalew Shibeshi, Department Heads’ Self-Perception of their Leadership Styles at Jimma University, Ethiopian Journal of Education and Sciences, 7:2 (2012) 97-114.

  59. Prashanth K. & Gemechis File, Infant and Child Mortality in Ethiopia: Statistical Analysis Approach, Ethiopian Journal of Education and Sciences, 5:2 (2010) 51-57.

  60. Fekede Tuli & Gemechis File, Practicum Experience in teacher Education. Ethiopian Journal of Education and Sciences, 5:1 (2009) 107-116.

Contact Address: Dean, College of Natural Sciences, Jimma University

P.O. Box 378

Office Telephone: +251471120739

Mobile: +251942565096

Jimma, Ethiopia

E-mail: gammeef@yahoo.com ; gemechis.file@ju.edu.et

Google Scholar: https://scholar.google.co.uk/citations?user=JWLNmWAAAAAJ&hl=en

Scopus Author ID: 57216182204

ORCID ID: https://orcid.org/0000-0003-1889-4690

Contact

Phone: +251471120739 /+251942565096

Email: gammeef@yahoo.com ; gemechis.file@ju.edu.et