Lomako, T.V. “On the Theory of Convergence and Compactness for Beltrami Equations”. Ukrains’kyi Matematychnyi Zhurnal 63, no. 3 (March 25, 2011): 341-340. Accessed February 5, 2023. https://umj.imath.kiev.ua/index.php/umj/article/view/2720.