Free vibrations of thin-walled spherical shells. Neliniini Kolyvannya, [S. l.], v. 26, n. 4, p. 528–542, 2023. DOI: 10.3842/nosc.v26i4.1438. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/1122. Acesso em: 6 dec. 2025.