%0 Journal Article
%A O. S. Kravchenko
%A B. A. Khesin
%T A central extension of the algebra of pseudodifferential symbols
%J Funkcionalʹnyj analiz i ego priloženiâ
%D 1991
%P 83-85
%V 25
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/FAA_1991_25_2_a16/
%G ru
%F FAA_1991_25_2_a16