Dragomir, Sever S., and Nicoleta M. Ionescu. “On Some Inequalities for Convex-Dominanted Functions”.
Anal. Numér. Théor. Approx.
, vol. 19, no. 1, Feb. 1990, pp. 21-27,
https://ictp.acad.ro/jnaat/journal/article/view/1990-vol19-no1-art4
.