TASMAMBETOV, Zh.N.; ISSENOVA, A.A. Bessel functions of two variables as solutions for systems of the second order differential equations. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 98, n. 2, p. 141–152, 2020. DOI: 10.31489/2020m2/141-152. Disponível em: https://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/350. Acesso em: 4 sep. 2025.