1. G.T. Anthony and M.G. Cox, The National Physical Laboratory's Data Approximation Subroutine Library, in:Algorithms for Approximation, eds. J.C. Mason and M.G. Cox (Clarendon Press, Oxford, 1987) pp. 669–687.
2. W. Boehm, Inserting new knots into B-spline curves, Comp. Aided Des. 12 (1980) 199–201.
3. C.W. Clenshaw and J.G. Hayes, Curve and surface fitting, J. Inst. Math. Appl. 1 (1965) 164–183.
4. M.G. Cox, An algorithm for spline interpolation, J. Inst. Math. Appl. 15 (1975) 95–108.
5. M.G. Cox, Numerical methods for the interpolation and approximation of data by spline functions, Ph. D. Thesis, City University, London (1975).