VITKAUSKAS, Jonas; ŠTIKONAS, Artūras. Relations between Spectrum Curves of Discrete Sturm-Liouville Problem with Nonlocal Boundary Conditions and Graph Theory. II. Lietuvos matematikos rinkinys, [S. l.], v. 62, n. A, p. 1–8, 2021. DOI: 10.15388/LMR.2021.25128. Disponível em: https://www.journals.vu.lt/LMR/article/view/25128.. Acesso em: 2 may. 2024.