@article{1029001363, author = {Berg, I. D.}, title = {On approximation of normal operators by weighted shifts.}, journal = {Michigan Math. J.}, volume = {21}, number = {3}, year = {1975}, pages = { 377-383}, language = {en}, url = {http://dml.mathdoc.fr/item/1029001363} }
Berg, I. D. On approximation of normal operators by weighted shifts.. Michigan Math. J., Tome 21 (1975) no. 3, pp. 377-383. http://gdmltest.u-ga.fr/item/1029001363/