V. I. Ryazanov, “Criteria of convergence for quasiconformal mappings and their generalizations”, Ukr. Mat. Zhurn., vol. 48, no. 5, pp. 665–674, May 1996, Accessed: Apr. 23, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/5300