On the nonstandard eigenvalue problem for the second-order ordinary differential equation. Neliniini Kolyvannya, [S. l.], v. 28, n. 3, p. 361–376, 2025. DOI: 10.3842/nosc.v28i3.1531 . Disponível em: https://nosc.imath.kiev.ua/index.php/nosc/article/view/1191. Acesso em: 12 apr. 2026.