Chizhonkov, E.V. “On Projection Operators for Numerical Stabilization”. Numerical Methods and Programming (Vychislitel’nye Metody i Programmirovanie) 5, no. 5 (September 21, 2004): 161–169. Accessed April 28, 2024. https://en.num-meth.ru/index.php/journal/article/view/127.