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3. Sur deux problèmes de M. Kolmogoroff concernant les chaînes dénombrables;Doeblin, Wolfgang;Bull. Soc. Math. France,1938
4. \bysame, Thèse, Paris (printed in Bucharest), 1938.
5. The law of large numbers for continuous stochastic processes;Doob, J. L.;Duke Math. J.,1940