@article {5265,
	title = {On the characterizations of some distinguished subclasses of Hilbert space operators},
	journal = {Acta Scientiarum Mathematicarum},
	volume = {84},
	number = {34},
	year = {2018},
	pages = {611-627},
	abstract = {
	In this note, we present several characterizations for some distinguished classes of bounded Hilbert space operators (self-adjoint operators, normal operators, unitary operators, and isometry operators) in terms of operator inequalities.

},
	author = {Chaima Bouraya and Seddik Ameur}
}
