TY  - JOUR
AU  - Yu. V. Egorov
TI  - Propagation of singularities for solutions of an equation of principal type
JO  - Sbornik. Mathematics
PY  - 1983
SP  - 527
EP  - 538
VL  - 46
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SM_1983_46_4_a5/
LA  - en
ID  - SM_1983_46_4_a5
ER  -