3W. J. Hsue, Y. S. Liao, S. S. Lu. Fundamental geometry analysis of wire electrical discharge machining in comer cutting. Machine Tools & Manufacture, 1999,39:651 - 667
4I. Fudos and C. M. Hofmann. Constraint - based parametric conics for CAD. Computer Aided Design, 1996,28 (2) :91 - 100
5Ahn Y. Conic approximation of planar curves[J]. Computer Aided Design, 2001,33(12) :867 -872
6H. Pottmann, S. Leopoldseder and M. Hofer. Approximation with active B - spline curves and surfaces. Proceedings of Pacific Graphics 2002, S. Coquillart, H.Y. Shum and S. M. Hu ( eds. ), 2002 [ C ] :8 - 25
7X. N. Yang. Curve fitting and fairing using conic splines. Computer Aided Design, 2004,36:461 - 472
8J. Y. Hu. Function plotting using conic splines. IEEE Computer Graphics & Applications, 1991 (1) :89 -94