1. Linpack user's guide;Dongerra,1979
2. User's guide for SOL/NPSOL;Gill,1983
3. Fowler, A H and Wilson, C W ‘Cubic spline, a curve fitting routine’ Report Number Y-1400 (Revision 1) Union Carbide Corp
4. Scalar and planar valued curve fitting using splines under tension;Cline;Comm. ACM,1974
5. Some piecewise polynomial alternatives to splines under tension;Nielson,1974