AMBROSIO, V. Periodic solutions for the non-local operator $(-\Delta+m^{2})^{s}-m^{2s}$ with $m\geq 0$. Topological Methods in Nonlinear Analysis, [S. l.], v. 49, n. 1, p. 75–103, 2016. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2016.063. Acesso em: 22 jul. 2024.