%0 Journal Article %A M. V. Novitskii %T Quasi-analytic classes of decreasing functions and integrals of motion of the Korteweg--de Vries equation %J Doklady Akademii Nauk %D 1994 %P 150-152 %V 335 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1994_335_2_a5/ %G ru %F DAN_1994_335_2_a5