PAPAGEORGIOU, NIKOLAOS S. “FIXED POINTS AND BEST APPROXIMATIONS FOR MEASURABLE MULTIFUNCTIONS WITH STOCHASTIC DOMAIN”. Tamkang Journal of Mathematics 23, no. 3 (September 1, 1992): 197–203. Accessed December 22, 2024. https://journals.math.tku.edu.tw/index.php/TKJM/article/view/4542.