Mel’nikV. S. “Topological Methods in the Theory of Operator Inclusions in Banach Spaces. I”. Ukrains’kyi Matematychnyi Zhurnal 58, no. 2 (February 25, 2006): 184–194. Accessed November 22, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3446.