EL-KARAMANY, A. M. Deformation of a Nonhomogeneous Visco-Elastic Hollow Sphere. Engineering Transactions, [S. l.], v. 31, n. 2, p. 267–277, 1983. Disponível em: https://et3.ippt.pan.pl/index.php/et/article/view/1941. Acesso em: 24 apr. 2025.