@article {29058,
	title = {Necessary and Sufficient Conditions for Best L1 Estimates of Ordinates of Convex Functions},
	journal = {IAENG International Journal of Applied Mathematics},
	volume = {Vol. 38},
	year = {2008},
	pages = {30-33},
	author = {SS Papakonstantinou and I. C. Demetriou}
}
