Sienkiewicz, Zbigniew, and Bogdan Wilczyński. “Minimum Weight Design of Vertically Vibrating 3-D Machine Foundation Coupled to Layered Half-Space 1”. Computer Assisted Methods in Engineering and Science 5, no. 4 (December 31, 1998): 373–387. Accessed May 8, 2026. http://cames.ippt.gov.pl/index.php/cames/article/view/1334.