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Gerald Farin, "From Conics to NURBS: A Tutorial and Survey," IEEE Computer Graphics and Applications, vol. 12, no. 5, pp. 7886, September/October, 1992.  
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@article{ 10.1109/38.156017, author = {Gerald Farin}, title = {From Conics to NURBS: A Tutorial and Survey}, journal ={IEEE Computer Graphics and Applications}, volume = {12}, number = {5}, issn = {02721716}, year = {1992}, pages = {7886}, doi = {http://doi.ieeecomputersociety.org/10.1109/38.156017}, publisher = {IEEE Computer Society}, address = {Los Alamitos, CA, USA}, }  
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TY  MGZN JO  IEEE Computer Graphics and Applications TI  From Conics to NURBS: A Tutorial and Survey IS  5 SN  02721716 SP78 EP86 EPD  7886 A1  Gerald Farin, PY  1992 VL  12 JA  IEEE Computer Graphics and Applications ER   
The main geometric features of the nonuniform rational Bsplines (NURBS) curve and surface representations are described. It is shown that most of these features are already exhibited by conics, which are a special case of NURBS. The properties typical of NURBS are discussed without dwelling on properties already present in polynomial curves. Conic sections and their representations using rational Bezier curves are reviewed. Cubic NURB curves, geometrical rational splines, rational and Bspline surfaces, and rational Bezier triangles are discussed.
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