Mel'nik, T. A. “An Iteration Method for the Problem of Averaging in the Standard Form”. Ukrains’kyi Matematychnyi Zhurnal 50, no. 3 (March 25, 1998): 426–429. Accessed April 7, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/4943.