AL-ZAMEL A, KHALIL R. ALTERNATION THEOREM FOR $C(I,X)$ AND APPLICATION TO BEST LOCAL APPROXIMATION. Tamkang J. Math. [Internet]. 1993 Jun. 1 [cited 2024 May 7];24(2):135-47. Available from: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/4483