%0 Journal Article %A M. L. Chumak %T Multiplicity of the spectrum of representations connected with integrable $G$-invariant Hamiltonian systems %J Funkcionalʹnyj analiz i ego priloženiâ %D 1989 %P 90-91 %V 23 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/FAA_1989_23_1_a21/ %G ru %F FAA_1989_23_1_a21