Litvinov, A. N., and I. I. Repin. “On Closeness of Distributions of Two Markovian Sums of Random Variables Without a Condition of Limit Neglections ”. Ukrains’kyi Matematychnyi Zhurnal 23, no. 2 (February 23, 1971): 248–253. Accessed December 5, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/8509.