Salimov, R. R., and E. A. Sevost’yanov. “Estimation of Dilatations for Mappings More General Than Quasiregular Mappings”. Ukrains’kyi Matematychnyi Zhurnal 62, no. 11 (November 25, 2010): 1531–1537. Accessed May 3, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/2977.