1. A Practical Guide to Splines;de Boor,1979
2. Piecewise polynomial interpolation and approximation;Birkhoff,1965
3. Error bounds for spline interpolation;Birkhoff;J. Math. Mech.,1964
4. Hermite interpolation errors for derivatives;Birkhoff;J. Math. Phys.,1967
5. Interpolation and Approximation;Davis,1961