TY  - JOUR
AU  - Malik, M. A.
TI  - Some Remarks on Abstract Differential Operators
JO  - Canadian mathematical bulletin
PY  - 1971
SP  - 445
EP  - 447
VL  - 14
IS  - 3
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1971-079-7/
DO  - 10.4153/CMB-1971-079-7
ID  - 10_4153_CMB_1971_079_7
ER  -