@article{MAT_1969_13_1_a7,
     author = {G. W. Mackey},
     title = {Ergodic theory and virtual groups},
     journal = {Matematika},
     pages = {122--144},
     publisher = {mathdoc},
     volume = {13},
     number = {1},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MAT_1969_13_1_a7/}
}