Kashuri, Artion, and Rozana Liko. “Fractional Trapezium Type Inequalities for Twice Differentiable Preinvex Functions and Their Applications”. An International Journal of Optimization and Control: Theories & Applications (IJOCTA) 10, no. 2 (July 1, 2020): 226–236. Accessed April 5, 2025. http://ijocta.org/index.php/files/article/view/795.