BANDYRSKII, B.; LAZURCHAK, I.; MAKAROV, V.; SAPAGOVAS, M. Eigenvalue Problem for the Second Order Differential Equation with Nonlocal. Nonlinear Analysis: Modelling and Control, [S. l.], v. 11, n. 1, p. 13–32, 2006. DOI: 10.15388/NA.2006.11.1.14762. Disponível em: https://www.journals.vu.lt/nonlinear-analysis/article/view/14762. Acesso em: 11 apr. 2025.