DAUITBEK, D.; TOKMAGAMBETOV, N. E.; TULENOV, K. S. Sturm-Liouville with δ–interaction. Journal of Mathematics, Mechanics and Computer Science, [S. l.], v. 74, n. 3, p. 22–27, 2012. Disponível em: https://bm.kaznu.kz/index.php/kaznu/article/view/145. Acesso em: 3 jul. 2024.