Peng, Cheng, et al. “RIEMANN-LIOUVILLE FRACTIONAL SIMPSON’S INEQUALITIES THROUGH GENERALIZED (m, h1, h2)-PREINVEXITY”. Italian Journal of Pure and Applied Mathematics, vol. 37, July 2017, pp. 345-67, https://journals.uniurb.it/index.php/ijpam/article/view/6796.