### References

http://www.ektf.hu/tanszek/matematika/gemma/gemma.html

JuhÃ¡sz Imre, Hoffmann MiklÇ’s. JGG= Journal for Geometry and Graphics

[1]The effect of knot modifications on the shape of B-spline curves.JGG, 2001,5, 111â€“119.

[2]Geometric aspects of knot modification of B-spline surfaces, JGG, , 2002,6, 141-149.

[3]Modifying a knot of B-spline curvesï¼ŒCAGD, 2003, 20, 243- 245.

[4]Constrained shape modification of cubic B-spline curves by means of knots, CAD, , 2004, 36, 437-445.

[5]Symmetric alteration of two knots of B-spline curves.JGG, 2005, accepted.

[6]A limit theorem for one-parameter alteration of two knots of B-spline curves. Annales Mathematicae et Informaticae, 2005, accepted. â€¦

[7] Barnabas Aszodi etc.. Nurbs fairing by knot vector optimization, Journal of WSCG, , 2004. 12.