1. An interpolation curve using a spline in tension;Schweikert;J. Math. & Phys.,1966
2. Scalar and planar valued curve fitting using splines under tension;Cline;Commun. ACM,1974
3. Some piecewise polynomial alternatives to splines in tension;Nielson,1974
4. Curve and surface fitting based on a variational criterion for smoothness;Mehlum,1969
5. Computational geometry. Achievements and problems;Forrest,1974