KOMAROV, G. N. Spectral problems with boundary and conjugating conditions depending on a parameter. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 47, n. 12, p. 1653–1660, 1995. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5558. Acesso em: 14 apr. 2025.