@article{SM_2009_200_12_a4,
     author = {V. V. Ryzhikov},
     title = {Spectral multiplicities and asymptotic operator properties of actions with invariant measure},
     journal = {Sbornik. Mathematics},
     pages = {1833--1845},
     publisher = {mathdoc},
     volume = {200},
     number = {12},
     year = {2009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2009_200_12_a4/}
}