ELNAZAROV, A. A. A method of asymptotic expansion of an m-parameter family of solutions for a quasilinear system of differential equations. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 50, n. 3, p. 445–450, 1998. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4947. Acesso em: 5 dec. 2025.