MEL'NIK, T. A. Aniterative method for the solution of some singularly perturbed cauchy problems. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 49, n. 8, p. 1055–1060, 1997. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5100. Acesso em: 5 dec. 2025.