Moskal'tsova, N.V. and Shurenkov, V.M. (1993) “Central limit theorem for centered frequencies of a countable ergodic markov chain”, Ukrains’kyi Matematychnyi Zhurnal, 45(12), pp. 1713–1715. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/5982 (Accessed: 5 December 2025).