1. A. Ya. Khinchin, The Theory of Large-Scale Maintenance [in Russian], Moscow (1963).
2. F. Zitek, ?Comments on a theorem proved by Korolyuk,? Chekhoslovatskii Matem. Zh., 7 (82), 318?319 (1957).
3. F. Zitek, ?The theory of homogeneous flows,? Chekhoslovatskii Matem. Zh.,8, (83), 448?459 (1958).
4. P. I. Kuznetsov and R. L. Stratonovich, ?The mathematical theory of correlated points,? Izv. Akad. Nauk SSSR, Ser. Matem.,20, 167?178 (1956).
5. B. V. Gnedenko and A. N. Kolmogorov, Limit Theorems for Means of Independent Random Variables [in Russian], Moscow (1948).