@article{1102911604,
author = {Campbell, Stephen L.},
title = {Linear operators for which $T^{\ast} T$ and $TT^{\ast}$ commute. II.},
journal = {Pacific J. Math.},
volume = {55},
number = {2},
year = {1974},
pages = { 355-361},
language = {en},
url = {http://dml.mathdoc.fr/item/1102911604}
}
Campbell, Stephen L. Linear operators for which $T^{\ast} T$ and $TT^{\ast}$ commute. II.. Pacific J. Math., Tome 55 (1974) no. 2, pp. 355-361. http://gdmltest.u-ga.fr/item/1102911604/