ŠTIKONAS, Artūras. A survey on stationary problems, Green’s functions and spectrum of Sturm–Liouville problem with nonlocal boundary conditions. Nonlinear Analysis: Modelling and Control, [S. l.], v. 19, n. 3, p. 301–334, 2014. DOI: 10.15388/NA.2014.3.1. Disponível em: https://www.journals.vu.lt/nonlinear-analysis/article/view/13638.. Acesso em: 29 apr. 2024.