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@article{PORMA_1981__40_4_115465, author = {Olubummo, A.}, title = {An approximation theorem for semigroups of operators}, journal = {Portugaliae mathematica}, pages = {383--391}, publisher = {mathdoc}, volume = {40}, number = {4}, year = {1981}, mrnumber = {0836099}, zbl = {0606.47041}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1981__40_4_115465/} }
Olubummo, A. An approximation theorem for semigroups of operators. Portugaliae mathematica, Tome 40 (1981) no. 4, pp. 383-391. http://geodesic.mathdoc.fr/item/PORMA_1981__40_4_115465/