Pavlenko, V. N. “On Solvability of Variational Inequalities With Discontinuous Semimonotone Operators”. Ukrains’kyi Matematychnyi Zhurnal 45, no. 3 (March 25, 1993): 443–447. Accessed April 14, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/5829.