Alomari, Mohammad W, Maslina Darus, and Sever S. Dragomir. 2010. “New Inequalities of Hermite-Hadamard Type for Functions Whose Second Derivatives Absolute Values Are Quasi-Convex”. Tamkang Journal of Mathematics 41 (4):353-59. https://doi.org/10.5556/j.tkjm.41.2010.498.