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@article{MZ_1977__157_172600, author = {Christoph Kopf}, title = {Remarks on a {Lemma} in {Ergodic} {Theory.}}, journal = {Mathematische Zeitschrift}, pages = {97--100}, publisher = {mathdoc}, volume = {157}, year = {1977}, zbl = {0367.28012}, url = {http://geodesic.mathdoc.fr/item/MZ_1977__157_172600/} }
Christoph Kopf. Remarks on a Lemma in Ergodic Theory.. Mathematische Zeitschrift, Tome 157 (1977), pp. 97-100. http://geodesic.mathdoc.fr/item/MZ_1977__157_172600/