Debela, Habtamu G., Mesfin M. Woldaregay, and Gemechis F. Duressa. 2022. “Robust Numerical Method for Singularly Perturbed Convection-Diffusion Type Problems With Non-Local Boundary Condition”. Mathematical Modelling and Analysis 27 (2):199–214. https://doi.org/10.3846/mma.2022.14256.