DZHUMABAEV, D. S.; UTESHOVA, R. E. Weighted limit solution of a nonlinear differential equation at a singular point and its property. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 69, n. 12, p. 1717–1722, 2017. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1815. Acesso em: 14 apr. 2025.