[1]
J. Drewko and M. Sperski, “Vibration of Multi-Chamber Shell Structures with Discontinuously Variable Cross-Sections”, Eng. Trans., vol. 39, no. 2, pp. 163–180, Jul. 1991, Accessed: Jan. 17, 2026. [Online]. Available: http://et.ippt.gov.pl/index.php/et/article/view/1620