OMKAR, R.; LALU, M.; PHANEENDRA, K. Numerical solution of differential – difference equations having an interior layer using nonstandard finite differences. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 110, n. 2, p. 104–115, 2023. DOI: 10.31489/2023m2/104-115. Disponível em: http://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/571. Acesso em: 10 jul. 2025.