Luchka, A. Y. “Methods for the Solution of Equations With Restrictions and the Sokolov Projection-Iterative Method”. Ukrains’kyi Matematychnyi Zhurnal 48, no. 11 (November 25, 1996): 1501-1509. Accessed May 19, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/5204.