POZUR, S. V. Singular Nonlinear Eigenvalue Problem for One Class of Second-Order Differential Equations. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 55, n. 10, p. 1431–1438, 2003. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4012. Acesso em: 5 dec. 2025.