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2. I. N. Kovalenko, “On a class of optimal decision functions for a binomial family of distributions,” Teor. Veroyatn. Primen., 4, No. 1, 101–105 (1959).
3. I. M. Kovalenko, “Bayesian decision functions for a hypergeometric set of distributions in choosing between two decisions,” Visn. Kyiv. Un-tu, Ser. Astronomiya, Matematika, ta Mekhanika, 2, No. 1, 159–162 (1959).
4. I. N. Kovalenko, “On the limit distribution of the value of the first jump,” Teor. Veroyatn. Primen., 5, No. 4, 469–472 (1960).
5. I. N. Kovalenko, “Investigation of a multilinear queuing system with a bounded sojourn time,” Ukr. Mat. Zh., 12, No. 4, 471–476 (1960). (“From the letters received by the Editorial Board,” UMZh, 13, No. 2, 239 (1961)).