DREWKO, J.; SPERSKI, M. Vibration of Multi-Chamber Shell Structures with Discontinuously Variable Cross-Sections. Engineering Transactions, [S. l.], v. 39, n. 2, p. 163–180, 1991. Disponível em: https://et3.ippt.pan.pl/index.php/et/article/view/1620. Acesso em: 24 apr. 2025.