1. Infinite Matrices and Sequence Spaces;Cooke,1950
2. An Introduction to Probability Theory and its Applications;Feller,1950
3. Markov Chains with an enumerable number of States and a Class of Cascade Processes;Foster;Proc. Cambridge Phil. Soc.,1951
4. Bull. de l’Univ;Kolmogorov;Moscou. Ser. Int. Sect. A.,1937
5. Markov process with an enumerable infinite number of possible states;Yosida;Japanese J. Math.,1939