%0 Journal Article
%A A. P. Gurevich
%A A. P. Khromov
%T First and second order differentiation operators with weight functions of variable sign
%J Matematičeskie zametki
%D 1994
%P 3-15
%V 56
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZM_1994_56_1_a0/
%G ru
%F MZM_1994_56_1_a0