DILDABEK, G.; TENGAYEVA, A. Constructing a basis from systems of eigenfunctions of one not strengthened regular boundary value problem. Journal of Mathematics, Mechanics and Computer Science, [S. l.], v. 84, n. 1, p. 36–44, 2018. Disponível em: https://bm.kaznu.kz/index.php/kaznu/article/view/421. Acesso em: 3 jul. 2024.