PERCHIK, E. L. A method for solution of nonlinear ordinary differential equations. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 47, n. 9, p. 1254–1260, 1995. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5525. Acesso em: 6 dec. 2025.