DEINEKA, V. S.; SERGIENKO, I. V.; SKOPETSKII, V. V. Eigenvalue problems with discontinuous eigenfunctions and their numerical solutions. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 51, n. 10, p. 1317–1323, 1999. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4730. Acesso em: 27 apr. 2025.