no. 1
Conditions for regular B-spline curves and surfaces
ESAIM: Modélisation mathématique et analyse numérique, Topics in computer aided geometric design , Tome 26 (1992) no. 1, pp. 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: Mod\'elisation math\'ematique et analyse num\'erique},
     pages = {177--190},
     year = {1992},
     publisher = {AFCET - Gauthier-Villars},
     address = {Paris},
     volume = {26},
     number = {1},
     mrnumber = {1155006},
     zbl = {0755.41009},
     language = {en},
     url = {https://www.numdam.org/item/M2AN_1992__26_1_177_0/}
}
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Dyn, N.; Levin, D.; Yad-Shalom, I. Conditions for regular $B$-spline curves and surfaces. ESAIM: Modélisation mathématique et analyse numérique, Topics in computer aided geometric design , Tome 26 (1992) no. 1, pp. 177-190. https://www.numdam.org/item/M2AN_1992__26_1_177_0/

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