E. A. Sevost'yanov, “Generalization of one Poletskii lemma to classes of space mappings”, Ukr. Mat. Zhurn., vol. 61, no. 7, pp. 969–975, Jul. 2009, Accessed: Feb. 17, 2026. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/3071