HochbergI. Ts., and ZambitskyM. K. “On the Theory of Linear Operators in Spaces With Two Norms ”. Ukrains’kyi Matematychnyi Zhurnal 18, no. 1 (January 29, 1966): 11-23. Accessed November 24, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/8649.