@article{CM_1981__43_1_59_0,
     author = {Zimmer, Robert J.},
     title = {An algebraic group associated to an ergodic diffeomorphism},
     journal = {Compositio Mathematica},
     pages = {59--69},
     publisher = {Sijthoff et Noordhoff International Publishers},
     volume = {43},
     number = {1},
     year = {1981},
     mrnumber = {631427},
     zbl = {0491.58020},
     language = {en},
     url = {http://www.numdam.org/item/CM_1981__43_1_59_0/}
}