V. I. Ryazanov, “Quasicqnformal mappings with restrictions in measure”, Ukr. Mat. Zhurn., vol. 45, no. 7, pp. 1009–1019, Jul. 1993, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/5894