Kulakov, I.Yu., D.A. Vologin, and V.V. Pickalov. “A Multigrid Algorithm for the Fan-Beam ROI-Tomography of Contrast Objects”. Numerical Methods and Programming (Vychislitel’nye Metody i Programmirovanie) 14, no. 38 (December 9, 2013): 543–548. Accessed April 25, 2024. https://en.num-meth.ru/index.php/journal/article/view/665.