SemenovaE. V., and SolodkiiS. G. “Approximate and Information Aspects of the Numerical solution of Unstable Integral and Pseudodifferential Equations”. Ukrains’kyi Matematychnyi Zhurnal 70, no. 3 (March 25, 2018): 429-444. Accessed December 5, 2020. http://umj.imath.kiev.ua/index.php/umj/article/view/1566.