Duka, Anila, and Ndriçim Sadikaj. “Quasiregular Mapping That Preserves Plane”. JOURNAL OF ADVANCES IN MATHEMATICS 12, no. 9 (October 30, 2016): 6603–6607. Accessed January 28, 2026. https://www.rajpub.com/index.php/jam/article/view/131.