PAPAGEORGIOU, NIKOLAOS S. “ON BEST APPROXIMATIONS IN THE LEBESGUE-BOCHNER SPACE $L^1(X)$”. Tamkang Journal of Mathematics 24, no. 3 (September 1, 1993): 303–307. Accessed December 22, 2024. https://journals.math.tku.edu.tw/index.php/TKJM/article/view/4501.