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3. E. I. Smirnov, Stek. Ker., No. 12 (1970).
4. M. L. Pershin, G? P. Lisovskaya, and V. E. Manevich, Stek. Ker., No. 8 (1985).
5. E. S. Wentzel, Probability Theory [Russian translation], Nauka, Moscow (1964).