SKUČAITĖ, Agnė; ŠTIKONAS, Artūras. Zeroes and poles of a characteristic function for Sturm–Liouville problem with nonlocal integral condition. Lietuvos matematikos rinkinys, [S. l.], v. 56, n. A, p. 95–100, 2015. DOI: 10.15388/LMR.A.2015.17. Disponível em: https://www.zurnalai.vu.lt/LMR/article/view/14942. Acesso em: 4 dec. 2025.