@article{AIHPB_1998__34_3_385_0,
     author = {Fitzsimmons, P. J.},
     title = {The quasi-sure ratio ergodic theorem},
     journal = {Annales de l'I.H.P. Probabilit\'es et statistiques},
     pages = {385--405},
     publisher = {Gauthier-Villars},
     volume = {34},
     number = {3},
     year = {1998},
     mrnumber = {1625863},
     zbl = {0909.60055},
     language = {en},
     url = {http://www.numdam.org/item/AIHPB_1998__34_3_385_0/}
}