X. Chen, M. Mori, and T. Hisada, “A sensitivity analysis for frictionless contact problems”, Comp. Assist. Methods Eng. Sci., vol. 3, no. 4, pp. 403–423, Dec. 1996, Accessed: Mar. 05, 2026. [Online]. Available: https://cames.ippt.gov.pl/index.php/cames/article/view/1439