Chesneau, Christophe. “Different Bounds for an Original Double Integral Involving Concave Functions”. Nonlinear Convex Analysis and Optimization: An International Journal on Numerical, Computation and Applications 4, no. 2 (October 1, 2025): 59–82. Accessed October 14, 2025. https://bangmodjmcs.com/index.php/ncao/article/view/189.