TY  - JOUR
AU  - Olubummo, A.
TI  - An approximation theorem for semigroups of operators
JO  - Portugaliae mathematica
PY  - 1981
SP  - 383
EP  - 391
VL  - 40
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/PORMA_1981__40_4_115465/
LA  - en
ID  - PORMA_1981__40_4_115465
ER  -