In this paper, some new estimates of Hermite-Hadamard-Fejér inequality for $n$-times differentiable preinvex functions are established. It is noteworthy that the weighted estimates of the left and right hand side of the Hermite-Hadamard inequalities involving generalized preinvex functions doesn't exist previously.
"Fejér-Hermite-Hadamard inequalities for $n$-times differentiable preinvex functions." Tbilisi Math. J. 14 (2) 255 - 270, June 2021. https://doi.org/10.32513/tmj/19322008137