PRYKARPATSKY, Ya. A.; SAMOILENKO, A. M. Investigation of invariant deformations of integral manifolds of adiabatically perturbed completely integrable Hamiltonian systems. II. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 51, n. 11, p. 1513–1528, 1999. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4753. Acesso em: 5 dec. 2025.