%0 Journal Article %A A. B. Nikolov %T Complete selection of commutating operators for ladder representations of Lie algebras of the group $U(6,6)$ %J Funkcionalʹnyj analiz i ego priloženiâ %D 1971 %P 86-88 %V 5 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/FAA_1971_5_2_a11/ %G ru %F FAA_1971_5_2_a11