Dragomir, S. S. 2016. “Integral Inequalities of the Hermite – Hadamard Type for $K$ -Bounded Norm Convex Mappings”.
Ukrains’kyi Matematychnyi Zhurnal
68 (10): 1330-47.
https://umj.imath.kiev.ua/index.php/umj/article/view/1924
.