@article {Demetriou-JCAM-2004,
	title = {A theorem for piecewise convex{\textendash}concave data approximation},
	journal = {Journal of Computational and Applied Mathematics},
	volume = {164-165},
	year = {2004},
	pages = {245{\textendash}254},
	author = {Ioannis C. Demetriou}
}
