@inbook {28976,
	title = {Least squares fitting to univariate data subject to restrictions on the signs of the second differences},
	booktitle = {Approximation Theory and Optimization, Tributes to M.J.D. Powell },
	year = {1997},
	pages = {109-132},
	publisher = {Cambridge University Press},
	organization = {Cambridge University Press},
	edition = {M. D. Buhmann and A. Iserles, Editors},
	address = {Cambridge, U.K. },
	author = {I. C. Demetriou and M. J. D. Powell}
}
