TY  - JOUR
AU  - Heersink, Rudolf
TI  - Characterization of certain differential operators in the solution of linear partial differential equations†
JO  - Glasgow mathematical journal
PY  - 1976
SP  - 83
EP  - 88
VL  - 17
IS  - 2
UR  - http://geodesic.mathdoc.fr/articles/10.1017/S0017089500002779/
DO  - 10.1017/S0017089500002779
ID  - 10_1017_S0017089500002779
ER  -