@techreport{Doray-Raj2009,
author = {Doray-Raj, S. and Graves, S. },
title= {Dierckx Spline: R Companion to “Curve and Surface Fitting with Splines”. R package version 1.1-4},
year = {2009},
URL = {http://CRAN.R-project.org/package=DierckxSpline]},
}