@article{GDZPPN002030365, title = {Convergence of an operator series.}, journal = {Aequationes mathematicae}, volume = {15}, year = {1977}, pages = {31-36}, zbl = {0376.47011}, url = {http://dml.mathdoc.fr/item/GDZPPN002030365} }
Koliha, J.J. Convergence of an operator series.. Aequationes mathematicae, Tome 15 (1977) pp. 31-36. http://gdmltest.u-ga.fr/item/GDZPPN002030365/