DYMARSKIĬ, Y.; NEPIYPA, D. Bifurcation in the case of twofold degeneration. The quasi-linear approach. Topological Methods in Nonlinear Analysis, [S. l.], v. 38, n. 1, p. 169–186, 2011. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2011.027. Acesso em: 22 jul. 2024.