Vibration frequency analysis of three-layered cylinder shaped shell with FGM middle layer under effect of various volume fraction laws. Punjab University Journal of Mathematics, [S. l.], v. 52, n. 12, p. 29–42, 2025. Disponível em: https://pujm.pu.edu.pk/index.php/pujm/article/view/386. Acesso em: 29 jun. 2025.