CHUIKO, S. M. Bifurcation of solutions of a linear Fredholm boundary-value problem. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 59, n. 8, p. 1148–1152, 2007. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3378. Acesso em: 6 dec. 2025.