Sokolov, N. V. “Generalization of the Prokhorov Multidimensional Analog of the Chebyshev Inequality”. Ukrains’kyi Matematychnyi Zhurnal, vol. 58, no. 4, Apr. 2006, pp. 573–576, https://umj.imath.kiev.ua/index.php/umj/article/view/3476.