@article{AMI_2007_34_a6,
     author = {Yajuan Li and Mikl\'os Hoffmann and Guozhao Wang},
     title = {On the shape parameter and constrained modification of {GB-spline} curves},
     journal = {Annales mathematicae et informaticae},
     pages = {51--59},
     publisher = {mathdoc},
     volume = {34},
     year = {2007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AMI_2007_34_a6/}
}