1. For proofs of this theorem the reader is referred to H. Cramér, Mathematical Methods of Statistics, Princeton University Press (1946), in particular, pp. 198–203.
2. For a complete presentation of the matrix method as applied to Markoff chains see M. Fréchet, Traité du Calcul des Probabilités, Tome I, Fase. III Second Livre, Paris, Gauthier-Villars (1936).