Le Minh Hieu, Truong Thi Hieu Hanh, and Dang Ngoc Hoang Thanh. 2019. “Finite-Difference Method for the Gamma Equation on Non-Uniform Grids”. Vietnam Journal of Science, Technology and Engineering 61 (4):3-8. https://doi.org/10.31276/VJSTE.61(4).03-08.