Potemkin, V. L., and V. I. Ryazanov. “On the Noncompactness of Classes of Mappings With Restrictions on Dilation in Measure”. Ukrains’kyi Matematychnyi Zhurnal 50, no. 11 (November 25, 1998): 1522–1531. Accessed December 5, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/4804.