@article{1077465191,
author = {Kaplansky, Irving},
title = {Products of normal operators},
journal = {Duke Math. J.},
volume = {20},
number = {1},
year = {1953},
pages = { 257-260},
language = {en},
url = {http://dml.mathdoc.fr/item/1077465191}
}
Kaplansky, Irving. Products of normal operators. Duke Math. J., Tome 20 (1953) no. 1, pp. 257-260. http://gdmltest.u-ga.fr/item/1077465191/