Park, S. “APPLICATIONS OF GENERALIZED ZORN’S LEMMA”. Journal of Nonlinear Analysis and Optimization: Theory & Applications (JNAO) 13, no. 2 (October 31, 2022): 75–84. accessed September 2, 2026. https://ph03.tci-thaijo.org/index.php/jnao/article/view/2739.