Bryzgalov, A., & Karmanov, F. (2010). Construction of the basis functions for computing by the method of physical-factor splitting in a finite-size domain. Numerical Methods and Programming (Vychislitel’nye Metody I Programmirovanie), 11(25), 289–298. Retrieved from https://en.num-meth.ru/index.php/journal/article/view/401