%0 Journal Article %A K. Urbanik %T Remarks on invariant functions in Markov processes %J Colloquium Mathematicum %D 1957 %P 223-230 %V 5 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-5-2-223-230/ %R 10.4064/cm-5-2-223-230 %G en %F 10_4064_cm_5_2_223_230