IvelicBradanovic S., LatifM. A., and PečarićJ. E. 2018. “Generalizations of Sherman’s Inequality via Fink’s identity and Green’s Function”. Ukrains’kyi Matematychnyi Zhurnal 70 (8), 1033-43. https://umj.imath.kiev.ua/index.php/umj/article/view/1615.