@article {6573,
	title = {On the characterizations of some distinguished subclasses of Hilbert space operators},
	journal = {Acta Scientiarum Mathematicarum},
	volume = {84},
	number = {3},
	year = {2018},
	pages = {611-627},
	publisher = {Springer},
	isbn = {2064-8316},
	author = {Bouraya, C and Seddik, A}
}
