SINGH, R. P.; REDDY, Y. N. Perturbation-Iteration Method for Solving Differential-Difference Equations Having Boundary Layer. Communications in Mathematics and Applications, [S. l.], v. 11, n. 4, p. 617–633, 2020. DOI: 10.26713/cma.v11i4.1431. Disponível em: https://www.rgnpublications.com/journals/index.php/cma/article/view/1431. Acesso em: 29 apr. 2024.