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@article{AM2_1977__15_136658, author = {J.J. Koliha}, title = {Convergence of an operator series. {(Short} {Communication).}}, journal = {Aequationes mathematicae}, pages = {303--304}, publisher = {mathdoc}, volume = {15}, year = {1977}, zbl = {0376.47011}, url = {http://geodesic.mathdoc.fr/item/AM2_1977__15_136658/} }
J.J. Koliha. Convergence of an operator series. (Short Communication).. Aequationes mathematicae, Tome 15 (1977), pp. 303-304. http://geodesic.mathdoc.fr/item/AM2_1977__15_136658/