Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{PORMA_1958__17_2_114801, author = {Putnam, C.R.}, title = {Commutators and normal operators}, journal = {Portugaliae mathematica}, pages = {59--62}, publisher = {mathdoc}, volume = {17}, number = {2}, year = {1958}, mrnumber = {0098989}, zbl = {0151.20102}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1958__17_2_114801/} }
Putnam, C.R. Commutators and normal operators. Portugaliae mathematica, Tome 17 (1958) no. 2, pp. 59-62. http://geodesic.mathdoc.fr/item/PORMA_1958__17_2_114801/