@article{SM_2012_203_7_a6,
     author = {V. V. Ryzhikov},
     title = {Spectral multiplicity for powers of weakly mixing automorphisms},
     journal = {Sbornik. Mathematics},
     pages = {1065--1076},
     publisher = {mathdoc},
     volume = {203},
     number = {7},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2012_203_7_a6/}
}