@article {67625,
	title = {On the injective norm and characterization of some subclasses of normal operators by inequalities or equalities},
	journal = {Journal of mathematical analysis and applicationsJournal of Mathematical Analysis and Applications},
	volume = {351},
	year = {2009},
	month = {2009},
	pages = {277-284},
	isbn = {0022-247X},
	author = {Seddik, Ameur}
}
