Kolesnik, A. D. “Asymptotic Relation for the Density of a Multidimensional Random Evolution With Rare Poisson Switchings”.
Ukrains’kyi Matematychnyi Zhurnal, vol. 60, no. 12, Dec. 2008, pp. 1631 – 1641,
https://umj.imath.kiev.ua/index.php/umj/article/view/3277.