Arutyunov, Aram, and Sergey Evgenyevich Zhukovskiy. “On Exact Penalties for Constrained Optimization Problems in Metric Spaces”. Eurasian Mathematical Journal 12, no. 4 (September 1, 2021). Accessed January 2, 2025. https://emj.enu.kz/index.php/main/article/view/237.