%0 Journal Article
%A V. P. Maslov
%A I. A. Shishmarev
%T $T$-product of hypoelliptic operators
%J Itogi Nauki i Tekhniki. Seriya Sovremennye Problemy Matematiki. Noveishie Dostizheniya
%D 1977
%P 137-197
%V 8
%I mathdoc
%U http://geodesic.mathdoc.fr/item/INTD_1977_8_a2/
%G ru
%F INTD_1977_8_a2