The approximate equations oscillations of cylindrical shells of variable thickness. Journal of Mathematics Mechanics and Computer Science, [S. l.], v. 104, n. 4, p. 71–84, 2019. DOI: 10.26577/JMMCS-2019-4-m8. Disponível em: https://bm.kaznu.kz/index.php/kaznu/article/view/678. Acesso em: 5 jul. 2026.