VYNNYTS’KYI, B.; KHATS’, R.; SHEPAROVYCH, I. Unconditional Bases of Systems of Bessel Functions. Eurasian Mathematical Journal, [S. l.], v. 11, n. 4, p. 76–86, 2020. DOI: 10.32523/2077-9879-2020-11-4-76-86. Disponível em: https://emj.enu.kz/index.php/main/article/view/198. Acesso em: 21 sep. 2026.