Samsoniya, Z. V., and I. G. Samkharadze. “On Quasiconformal Mappings Corresponding to the Beltrami Equation”. Ukrains’kyi Matematychnyi Zhurnal 51, no. 10 (October 25, 1999): 1391–1397. Accessed December 5, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/4738.