Zhukov, K.A., and A.V. Popov. 2012. “Finite-Difference and Projection-Difference Schemes for the Unsteady Motion of a Viscous Weakly Compressible Gas”. Numerical Methods and Programming (Vychislitel’nye Metody I Programmirovanie) 13 (31):67-73. https://en.num-meth.ru/index.php/journal/article/view/500.