Georgiev, Pando. “ Variational Principles for Monotone Variational Inequalities: The Single-Valued Case”. Serdica Mathematical Journal 49, no. 1–3 (November 20, 2023): 77–96. Accessed October 27, 2026. https://serdica-stage.math.bas.bg/index.php/serdica/article/view/36.