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4. I. S. Volkov, “On the distribution of sums of random variables defined on a homogeneous Markov chain with a finite number of states” [in Russian], Teor. Veroyatn. Primen. 3, No. 4, 413–429 (1958).
5. J. Keilson and D. M. G. Wishart, “A central limit theorem for processes defined on a finite Markov chain,” Proc. Camb. Philos. Soc. 60, 547–567 (1964).