DUDNYTSKYI, P. M.; PETRYSHYN, R. I.; SAMOILENKO, A. M. Reducibility of a nonlinear oscillation system with pulse influence in the neighborhood of an integral manifold. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 56, n. 8, p. 1076–1094, 2004. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3823. Acesso em: 6 dec. 2025.