Lampis, M., and D. Ya. Petrina. 2004. “Stochastic Dynamics and Hierarchy for the Boltzmann Equation With Arbitrary Differential Scattering Cross Section”. Ukrains’kyi Matematychnyi Zhurnal 56 (12), 1629-53. https://umj.imath.kiev.ua/index.php/umj/article/view/3871.