Vshivkov, V., and A. Terekhov. “On the Self-Force in the Particle-in-Cell Method”. Numerical Methods and Programming (Vychislitel’nye Metody I Programmirovanie), vol. 9, no. 15, Mar. 2008, pp. 48-57, https://en.num-meth.ru/index.php/journal/article/view/295.