Liu, Zhenhai, Liang Lu, and Xiufeng Guo. “Existence Results for a Class of Semilinear Differential Variational Inequalities With Nonlocal Boundary Conditions”. Topological Methods in Nonlinear Analysis 55, no. 2 (May 6, 2020): 429–449. Accessed April 19, 2024. https://apcz.umk.pl/TMNA/article/view/TMNA.2019.088.