1. Complex Analysis;Ahlfors,1966
2. Interpolation Spaces;Bergh,1976
3. The quasiinterpolant as a tool in elementary polynomial spline theory;de Boor,1973
4. Bounding the error in spline interpolation;de Boor;SIAM Rev.,1974
5. Splines as linear combinations of B-splines;de Boor,1976