%0 Journal Article %A M. T. Karaev %T On the spectral multiplicity of a direct sum of operators %J Colloquium Mathematicum %D 2006 %P 105-112 %V 104 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm104-1-7/ %R 10.4064/cm104-1-7 %G en %F 10_4064_cm104_1_7