%0 Journal Article
%A V. P. Maslov
%T A generalization of the concept of characteristics for $A$-pseudodifferential operators with operator-valued symbol
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1970
%V 25
%N 6
%U http://geodesic.mathdoc.fr/item/RM_1970_25_6_a12/
%G ru
%F RM_1970_25_6_a12