1. The Theory of Splines and their Applications;Ahlberg,1967
2. On the order of convergence of natural cubic spline interpolation. Abstract 67T-315, Notices;Atkinson;Am. Math. Soc.,1967
3. Error bounds for spline interpolation;Birkhoff;J. Math. Mech.,1964
4. Best approximation properties of spline functions of odd degree;de Boor;J. Math. Mech.,1963
5. On uniform approximation by splines;de Boor;J. Approx. Theory,1968