Conditions for regular B-spline curves and surfaces
ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique, Volume 26 (1992) no. 1, p. 177-190 
@article{M2AN_1992__26_1_177_0,
     author = {Dyn, N. and Levin, D. and Yad-Shalom, I.},
     title = {Conditions for regular $B$-spline curves and surfaces},
     journal = {ESAIM: Mathematical Modelling and Numerical Analysis - Mod\'elisation Math\'ematique et Analyse Num\'erique},
     publisher = {Dunod},
     volume = {26},
     number = {1},
     year = {1992},
     pages = {177-190},
     zbl = {0755.41009},
     mrnumber = {1155006},
     language = {en},
     url = {http://www.numdam.org/item/M2AN_1992__26_1_177_0}
}

Dyn, N.; Levin, D.; Yad-Shalom, I. Conditions for regular $B$-spline curves and surfaces. ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique, Volume 26 (1992) no. 1, pp. 177-190. http://www.numdam.org/item/M2AN_1992__26_1_177_0/

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