%0 Journal Article
%A V. V. Grushin
%T Hypoelliptic differential equations and pseudodifferential operators with operator-valued symbols
%J Sbornik. Mathematics
%D 1972
%P 497-514
%V 17
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SM_1972_17_4_a2/
%G en
%F SM_1972_17_4_a2