%0 Journal Article %A M. V. Karasev %T The asymptotic spectrum and oscillation front for operators with nonlinear commutation relations %J Doklady Akademii Nauk %D 1978 %P 15-18 %V 243 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1978_243_1_a1/ %G ru %F DAN_1978_243_1_a1