SARSENBI, A.A. Unconditional basicity of eigenfunctions’ system of Sturm-Liouville operator with an involutional perturbation. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 91, n. 3, p. 117–127, 2018. DOI: 10.31489/2018m3/117-127. Disponível em: https://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/306. Acesso em: 9 jul. 2025.