%0 Journal Article
%A Yu. V. Egorov
%T Pseudodifferential operators of principal type
%J Sbornik. Mathematics
%D 1967
%P 319-333
%V 2
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SM_1967_2_3_a3/
%G en
%F SM_1967_2_3_a3