no. 3
A note on cocycles in ergodic theory
Compositio Mathematica, Tome 28 (1974) no. 3, pp. 343-350. 
@article{CM_1974__28_3_343_0,
     author = {Parry, William},
     title = {A note on cocycles in ergodic theory},
     journal = {Compositio Mathematica},
     pages = {343--350},
     publisher = {Noordhoff International Publishing},
     volume = {28},
     number = {3},
     year = {1974},
     zbl = {0287.28011},
     mrnumber = {352407},
     language = {en},
     url = {archive.numdam.org/item/CM_1974__28_3_343_0/}
}
Parry, William. A note on cocycles in ergodic theory. Compositio Mathematica, Tome 28 (1974) no. 3, pp. 343-350. http://archive.numdam.org/item/CM_1974__28_3_343_0/

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