Touzaline, Arezki. “Optimal Control of a Frictionless Unilateral Contact Problem”. Bulletin de la Société des Sciences et des Lettres de Łódź 69, no. 1 (October 1, 2020): 43–56. Accessed September 13, 2026. https://journals.ltn.lodz.pl/Bulletin/article/view/1001.