1. Piecewise polynomial interpolation and approximation;Birkhoff, Garrett,1965
2. 2. T. R. Lucas, Error bounds for interpolating cubic splines under various end conditions, Notices Amer. Math. Soc. 19 (1972), A-795. Abstract #699-B15.
3. Cubic spline interpolation of continuous functions;Marsden, Martin;J. Approximation Theory,1974
4. An identity for spline functions with applications to variation-diminishing spline approximation;Marsden, Martin J.;J. Approximation Theory,1970
5. On variation diminishing spline approximation methods;Marsden, Martin;Mathematica (Cluj),1966