@article{2975, author = {Olubummo, A.}, title = {An approximation theorem for semigroups of operators}, journal = {Portugaliae mathematica}, volume = {40}, year = {1981}, pages = {383-391}, zbl = {0606.47041}, mrnumber = {0836099}, language = {en}, url = {http://dml.mathdoc.fr/item/2975} }
Olubummo, A. An approximation theorem for semigroups of operators. Portugaliae mathematica, Tome 40 (1981) pp. 383-391. http://gdmltest.u-ga.fr/item/2975/