@article{JGG_2005_9_1_JGG_2005_9_1_a4,
     author = {M. Hoffmann and I. Juh�sz },
     title = {Symmetric {Alteration} of {Two} {Knots} of {B-Spline} {Curves}},
     journal = {Journal for geometry and graphics},
     pages = {43--49},
     year = {2005},
     volume = {9},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/JGG_2005_9_1_JGG_2005_9_1_a4/}
}