[1]
V. F. Babenko and M. E. Gorbenko, “On the uniqueness of an element of the best $L_1$-approximation for functions with values in a banach space”,
Ukr. Mat. Zhurn., vol. 52, no. 1, pp. 30–34, Jan. 2000, Accessed: Apr. 09, 2025. [Online]. Available:
https://umj.imath.kiev.ua/index.php/umj/article/view/4393