Sidelnikov, G.L., and A.S. Starovoytov. 2003. “Application of Nonuniform Grids for Discretization and Numerical Solution of Systems of Integro-Differential Equations When Modeling the Dynamics of Electron Beams in Plasma”. Numerical Methods and Programming (Vychislitel’nye Metody I Programmirovanie) 4 (4):254-57. https://en.num-meth.ru/index.php/journal/article/view/96.