Ruzhevich, N. A. “On a Limit Theorem for an Additive Functional on a Nonrecurrent Markovian Chain”. Ukrains’kyi Matematychnyi Zhurnal 49, no. 2 (February 25, 1997): 262–271. Accessed May 19, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/5003.