Babenko, V. F., and M. E. Tkachenko. “Problem of Uniqueness of an Element of the Best Nonsymmetric <i>L</i><sub> 1</sub>-Approximation of Continuous Functions With Values in <i>KB</I&gt; -Spaces”. Ukrains’kyi Matematychnyi Zhurnal 60, no. 7 (July 25, 2008): 867 -. Accessed March 28, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3205.