1. A general method for the construction of interpolating or smoothing spline functions;Anselone;Numer. Math.,1968
2. Spline transformations;Boneva;J. Royal Statist. Soc. Ser. B,1971
3. Appendix to Splines and histograms;de Boor,1973
4. A remark concerning perfect splines;deBoor;Bull. Amer. Math. Soc.,1974
5. Structure and Characterization of pLg-Splines;Copley,1974