ŠEDA, V. $R_{\delta}$-set of solutions to a boundary value problem. Topological Methods in Nonlinear Analysis, [S. l.], v. 16, n. 1, p. 93–101, 2000. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2000.032. Acesso em: 22 jul. 2024.