Sevost’yanov, E. A. “On the Integral Characterization of Some Generalized Quasiregular Mappings and the Significance of the Conditions of Divergence of Integrals in the Geometric Theory of Functions”. Ukrains’kyi Matematychnyi Zhurnal 61, no. 10 (October 25, 2009): 1367-1380. Accessed April 26, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3107.