TY  - JOUR
AU  - B. Yu. Sternin
TI  - Differential equations of subprincipal type
JO  - Sbornik. Mathematics
PY  - 1986
SP  - 37
EP  - 67
VL  - 53
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SM_1986_53_1_a2/
LA  - en
ID  - SM_1986_53_1_a2
ER  -