NAKONECHNA, S. O. On the application of approximation of the central manifold of a stationary point to one critical case. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 50, n. 3, p. 430–432, 1998. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4944. Acesso em: 7 apr. 2025.