Lods, B., and G. Toscani. 2005. “Long-Time Behavior of Nonautonomous Fokker-Planck Equations and Cooling of Granular Gases”. Ukrains’kyi Matematychnyi Zhurnal 57 (6): 778–789. https://umj.imath.kiev.ua/index.php/umj/article/view/3644.