no. 1
Parametric representation of quadric surfaces
ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique, Tome 26 (1992) no. 1, pp. 191-200. 
@article{M2AN_1992__26_1_191_0,
     author = {Boehm, W. and Hansford, D.},
     title = {Parametric representation of quadric surfaces},
     journal = {ESAIM: Mathematical Modelling and Numerical Analysis - Mod\'elisation Math\'ematique et Analyse Num\'erique},
     pages = {191--200},
     publisher = {AFCET - Gauthier-Villars},
     address = {Paris},
     volume = {26},
     number = {1},
     year = {1992},
     zbl = {0766.65011},
     mrnumber = {1155007},
     language = {en},
     url = {http://www.numdam.org/item/M2AN_1992__26_1_191_0/}
}
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Boehm, W.; Hansford, D. Parametric representation of quadric surfaces. ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique, Tome 26 (1992) no. 1, pp. 191-200. http://www.numdam.org/item/M2AN_1992__26_1_191_0/

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