In this paper, we establish two identities for functions of two variables and apply them to give new Hermite–Hadamard type fractional integral inequalities for double fractional integrals involving functions whose derivatives are bounded or co-ordinates convex function on Δ≔[a,b]×[c,d] in R2 with a<b,c<d.
Akkurt, A., Sarıkaya, M. Z., Budak, H., & Yıldırım, H. (2017). On the Hadamard’s type inequalities for co-ordinated convex functions via fractional integrals. Journal of King Saud University - Science, 29(3), 380–387. https://doi.org/10.1016/j.jksus.2016.06.003