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2. Asker, B.,The Spline Curve, A Smooth Interpolation Function Used in Numerical Design of Ship-Lines, BIT 2, pp. 76–82, 1962.
3. Walsh, J. L., Ahlberg, J. H., and Nilson, E. N.,Best Approximation Properties of the Spline Fit, J. Math. Mech. 11, pp. 225–234, 1962.
4. Greville, T. N. E.,Numerical Procedures for Interpolation by Spline Functions, Mathematics Research Center, University of Wisconsin, Technical Summary Report No. 450, January 1964 (Madison, Wis.).
5. Mehlum, E.,A Curve-Fitting Method Based on a Variational Criterion, BIT 4, pp. 213–223, 1964.