@article {29042,
	title = {Modifications of matrix QR factorizations in least squares data fitting by nonnegative divided differences},
	journal = {HERMIS-$\mu\pi$ Intl. Journal},
	volume = {Vol. 4},
	year = {2003},
	pages = {183-197},
	author = {I. C. Demetriou and EA Lipitakis}
}
