%0 Journal Article %A V. V. Ryzhikov %T Spectral multiplicity for powers of weakly mixing automorphisms %J Sbornik. Mathematics %D 2012 %P 1065-1076 %V 203 %N 7 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_2012_203_7_a6/ %G en %F SM_2012_203_7_a6