@article{SJC_2009_3_4_a4,
     author = {G. Petkov, Emiliyan},
     title = {Development and {Implementation} of {NURBS} {Models} of {Quadratic} {Curves} and {Surfaces}},
     journal = {Serdica Journal of Computing},
     pages = {425--448},
     publisher = {mathdoc},
     volume = {3},
     number = {4},
     year = {2009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SJC_2009_3_4_a4/}
}