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@article{MOMA_1978__86_177876, author = {Ulrich Krengel}, title = {On the {Speed} of {Convergence} in the {Ergodic} {Theorem.}}, journal = {Monatshefte f\"ur Mathematik}, pages = {3--6}, publisher = {mathdoc}, volume = {86}, year = {1978}, zbl = {0352.28008}, url = {http://geodesic.mathdoc.fr/item/MOMA_1978__86_177876/} }
Ulrich Krengel. On the Speed of Convergence in the Ergodic Theorem.. Monatshefte für Mathematik, Tome 86 (1978), pp. 3-6. http://geodesic.mathdoc.fr/item/MOMA_1978__86_177876/