E. Songolo, M. (2016) “A Positivity-Preserving Nonstandard Finite Difference Scheme for Parabolic System with Cross-Diffusion Equations and Nonlocal Initial Conditions”, American Scientific Research Journal for Engineering, Technology, and Sciences, 18(1), pp. 252–258. Available at: https://asrjetsjournal.org/American_Scientific_Journal/article/view/1611 (Accessed: 12 September 2025).