V.L. Makarov, and I. P. Gavrilyuk. 2020. “The Fictitious Domain Method and Homotopy As a New Alternative for Multidimensional Partial Differential Equations in Domains of Any Shape”. Ukrains’kyi Matematychnyi Zhurnal 72 (2), 191-208. http://umj.imath.kiev.ua/index.php/umj/article/view/1101.