TY  - CHAP
AU  - Abramczuk, W.
TI  - A remark on ellipticity of systems of linear partial differential equations with constant coefficients
BT  - Analytic solutions of partial differential equations - Trento, 1981
AU  - Collectif
T3  - Astérisque
PY  - 1981
SP  - 117
EP  - 128
IS  - 89-90
PB  - Société mathématique de France
UR  - http://archive.numdam.org/item/AST_1981__89-90__117_0/
LA  - en
ID  - AST_1981__89-90__117_0
ER  -