LampisM., and PetrinaD. Ya. 2002. “Spatially-Homogeneous Boltzmann Hierarchy As Averaged Spatially-Inhomogeneous Stochastic Boltzmann Hierarchy”. Ukrains’kyi Matematychnyi Zhurnal 54 (1), 78-93. https://umj.imath.kiev.ua/index.php/umj/article/view/4042.