BabenkoV. V. “Optimization of Interval Formulas for Approximate Integration of Set-Valued Functions Monotone With Respect to Inclusion”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 63, no. 11, Nov. 2011, pp. 1565-9, https://umj.imath.kiev.ua/index.php/umj/article/view/2826.