@article{AIHPB_1997__33_4_491_0,
     author = {Lacey, Michael T.},
     title = {The return time theorem fails on infinite measure-preserving systems},
     journal = {Annales de l'I.H.P. Probabilit\'es et statistiques},
     pages = {491--495},
     publisher = {Gauthier-Villars},
     volume = {33},
     number = {4},
     year = {1997},
     mrnumber = {1465799},
     zbl = {0894.60001},
     language = {en},
     url = {http://www.numdam.org/item/AIHPB_1997__33_4_491_0/}
}