TY  - JOUR
AU  - Veikko T. Purmonen
TI  - On generalized a priori estimates for quasi-elliptic differential operators
JO  - Annales Fennici Mathematici
PY  - 1979
SP  - 227
EP  - 252
VL  - 4
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1978-79.0420/
DO  - 10.5186/aasfm.1978-79.0420
LA  - en
ID  - AFM_1979_4_2_a4
ER  -