TY  - JOUR
AU  - A. Pelczar
TI  - Some qualitative problems in the theory of second order partial differential equations
JO  - Annales Polonici Mathematici
PY  - 1990
SP  - 1
EP  - 17
VL  - 52
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/ap-52-1-1-17/
DO  - 10.4064/ap-52-1-1-17
LA  - en
ID  - 10_4064_ap_52_1_1_17
ER  -