RACHŮNKOVÁ, Irena. Topological degree methods in BVPS with nonlinear conditions. Annales Mathematicae Silesianae, [S. l.], v. 10, p. 103–110, 1996. Disponível em: https://journals.us.edu.pl/index.php/AMSIL/article/view/14197. Acesso em: 12 apr. 2025.