@article{JGG_2002_6_2_a3,
     author = {M. Hoffmann and I. Juhasz},
     title = {Geometric {Aspects} of {Knot} {Modification} of {B-spline} {Surfaces}},
     journal = {Journal for geometry and graphics},
     pages = {141--15},
     publisher = {mathdoc},
     volume = {6},
     number = {2},
     year = {2002},
     url = {http://geodesic.mathdoc.fr/item/JGG_2002_6_2_a3/}
}