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2. Infinite Matrices ans Sequence Spaces;Cooke,1950
3. An Introduction to Probablility Theory and its Applications;Feller,1950
4. On the Stochastic Matrices Associated with certain Queuing Processes;Foster;Annals of Matehmatical Statistics,1953
5. Bulletin de l’Université Moscou;Kolmogorov;Ser. Int. Sect. A.,1937