Zahlivnaya О. V. Introduction of local coordinates for a countable system of differential equations in the neighborhood of an invariant manifold. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 48, n. 4, p. 443–451, 1996. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5309. Acesso em: 6 dec. 2025.