CHABROWSKI, Jan; YANG, Jianfu. On Schrödinger equation with periodic potential and critical Sobolev exponent. Topological Methods in Nonlinear Analysis, [S. l.], v. 12, n. 2, p. 245–261, 1998. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1998.040. Acesso em: 8 jul. 2025.