@article{GDZPPN002030217, title = {Convergence of an operator series. (Short Communication).}, journal = {Aequationes mathematicae}, volume = {15}, year = {1977}, pages = {303-304}, zbl = {0376.47011}, url = {http://dml.mathdoc.fr/item/GDZPPN002030217} }
Koliha, J.J. Convergence of an operator series. (Short Communication).. Aequationes mathematicae, Tome 15 (1977) pp. 303-304. http://gdmltest.u-ga.fr/item/GDZPPN002030217/