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@article{JRAM_1960__205_150455, author = {Eberhard Hopf}, title = {On the {Ergodic} {Theorem} for {Positive} {Linear} {Operators.}}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {101--106}, publisher = {mathdoc}, volume = {205}, year = {1960}, zbl = {0103.33801}, url = {http://geodesic.mathdoc.fr/item/JRAM_1960__205_150455/} }
Eberhard Hopf. On the Ergodic Theorem for Positive Linear Operators.. Journal für die reine und angewandte Mathematik, Tome 205 (1960), pp. 101-106. http://geodesic.mathdoc.fr/item/JRAM_1960__205_150455/