［7］Joe B. Quartic beta-splines[J]. ACM Trans. Graph. , 1990,9:301～337.
[6]
［10］Walz G. Some identities for trigonometric B-splines with application to curve design[J]. BIT, 1997,37:189～201.
[7]
［4］Joe B. Multiple-knot and rational cubic Beta-spline[J]. ACM Trans. Graph. 1989,8:100～120.
[8]
［6］Goodman T N T. Constructing piecewise rational curves with Frenet frame continuity[J]. Computer Aided Geometric Design,1990,7(7) :15～31.
[9]
［8］Schoenberg I J. On trigonometric spline interpolation [J]. J.Math. Mech., 1964,13:795～825.
[10]
［9］Lyche T, Winther R. A stable recurrence relation for trigonometric B-splines[J]. J. Approx. Theory, 1979, 25:266～279.
[11]
［11］Han X L. The parametric cubic trigonometric spline curve with factors [A]. In:Proceedings of the 6th International Conference on Computer Aided Design and Computer Graphics [C].Shanghai: Wen Hui Publishers, 1999:1021～1024.
