Mykhaylyuk, V. V., I. V. Krasikova, and M. M. Popov. “Operators Defined on $L_1$ Which ‘nowhere’ Attain Their Norm”. Methods of Functional Analysis and Topology 16, no. 1 (March 25, 2010): 17–27. Accessed December 16, 2025. https://zen.imath.kiev.ua/index.php/mfat/article/view/436.