“Hermite-Hadamard Type Integral Inequalities for Functions Whose Mixed Partial Derivatives Are Co-ordinated Preinvex”, Punjab Univ. J. Math., vol. 52, no. 1, pp. 63–76, May 2025, Accessed: Sep. 02, 2026. [Online]. Available: https://pujm.pu.edu.pk/index.php/pujm/article/view/313