%0 Journal Article %A V. G. Hryptun %T Function classes quasianalytic relative to first order partial differential operators %J Sbornik. Mathematics %D 1968 %P 17-31 %V 6 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1968_6_1_a1/ %G en %F SM_1968_6_1_a1