Park, S. (2011) “A GENESIS OF GENERAL KKM THEOREMS FOR ABSTRACT CONVEX SPACES”, Journal of Nonlinear Analysis and Optimization: Theory & Applications (JNAO), 2(1), pp. 141–154. available at: https://ph03.tci-thaijo.org/index.php/jnao/article/view/2623 (accessed: 2 September 2026).