TY  - JOUR
AU  - V. P. Maslov
TI  - A generalization of the concept of characteristics for $A$-pseudodifferential operators with operator-valued symbol
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 1970
VL  - 25
IS  - 6
UR  - http://geodesic.mathdoc.fr/item/RM_1970_25_6_a12/
LA  - ru
ID  - RM_1970_25_6_a12
ER  -