NGUYEN, N. V. Existence of periodic traveling-wave solutions for a nonlinear Schrödinger system: A topological approach. Topological Methods in Nonlinear Analysis, [S. l.], v. 43, n. 1, p. 129–155, 2016. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2014.009. Acesso em: 27 may. 2024.