MEDERSKI, J. Solutions to a nonlinear Schrödinger equation with periodic potential and zero on the boundary of the spectrum. Topological Methods in Nonlinear Analysis, [S. l.], v. 46, n. 2, p. 755–772, 2015. DOI: 10.12775/TMNA.2015.067. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2015.067. Acesso em: 28 mar. 2024.