@article {66223,
	title = {On the invertibility of $ AA^{+}-A^{+} A $ in a Hilbert space},
	journal = {Matemati{\v c}ki VesnikMatemati{\v c}ki Vesnik},
	year = {2014},
	month = {2014},
	pages = {101-108},
	isbn = {0025-5165},
	author = {Menkad, Safa and Guedjiba, Said}
}
