@article{VMUMM_1998_2_a6,
     author = {V. M. Manuilov and E. V. Troitskii and M. Frank},
     title = {Actions of groups and conditional expectations of finite index},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {30--34},
     publisher = {mathdoc},
     number = {2},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1998_2_a6/}
}