Kucheruk, T. A., and A. Y. Luchka. “Iterative Method for the Solution of Linear Equations With Restrictions”. Ukrains’kyi Matematychnyi Zhurnal, vol. 54, no. 4, Apr. 2002, pp. 472-8, https://umj.imath.kiev.ua/index.php/umj/article/view/4085.