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@article{AM2_1977__16_136672, author = {J.J. Koliha}, title = {Convergence of an operator series.}, journal = {Aequationes mathematicae}, pages = {31--36}, publisher = {mathdoc}, volume = {16}, year = {1977}, zbl = {0376.47011}, url = {http://geodesic.mathdoc.fr/item/AM2_1977__16_136672/} }
J.J. Koliha. Convergence of an operator series.. Aequationes mathematicae, Tome 16 (1977), pp. 31-36. http://geodesic.mathdoc.fr/item/AM2_1977__16_136672/