@article{GDZPPN002033283,
title = {Finite return times for measure-preserving transformations.},
journal = {Aequationes mathematicae},
volume = {22},
year = {1981},
pages = {24-29},
zbl = {0496.28018},
url = {http://dml.mathdoc.fr/item/GDZPPN002033283}
}
Clark, Jack; David, Karl. Finite return times for measure-preserving transformations.. Aequationes mathematicae, Tome 22 (1981) pp. 24-29. http://gdmltest.u-ga.fr/item/GDZPPN002033283/