FABRY, Christian; HABETS, Patrick. Degree computations for positively homogeneous differential equations. Topological Methods in Nonlinear Analysis, [S. l.], v. 23, n. 1, p. 73–88, 2004. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2004.004. Acesso em: 8 jul. 2025.