TY  - JOUR
AU  - N. A. Shananin
TI  - On necessary conditions for the local solvability of equations of quasiprincipal type
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 1977
VL  - 32
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/RM_1977_32_2_a21/
LA  - ru
ID  - RM_1977_32_2_a21
ER  -