@article{FAA_1977_11_3_a2,
     author = {B. M. Gurevich},
     title = {Perfect partitions for ergodic flows},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {20--23},
     year = {1977},
     volume = {11},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1977_11_3_a2/}
}