Book review: Topological degree aproach to bifurcation problems, by Michal Fečkan. Neliniini Kolyvannya, [S. l.], v. 12, n. 2, p. 286–289, 2009. Disponível em: https://nosc.imath.kiev.ua/index.php/nosc/article/view/526. Acesso em: 12 apr. 2026.