Messaoud, A., and A. Rahali. “Another Proof for the Continuity of the Lipsman Mapping”. Ukrains’kyi Matematychnyi Zhurnal 72, no. 7 (July 15, 2020): 945–951. Accessed April 11, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/548.