no. 1
On convex Bézier triangles
ESAIM: Modélisation mathématique et analyse numérique, Topics in computer aided geometric design , Tome 26 (1992) no. 1, pp. 23-36 
@article{M2AN_1992__26_1_23_0,
     author = {Prautzsch, H.},
     title = {On convex {B\'ezier} triangles},
     journal = {ESAIM: Mod\'elisation math\'ematique et analyse num\'erique},
     pages = {23--36},
     year = {1992},
     publisher = {AFCET - Gauthier-Villars},
     address = {Paris},
     volume = {26},
     number = {1},
     mrnumber = {1154998},
     zbl = {0748.41016},
     language = {en},
     url = {https://www.numdam.org/item/M2AN_1992__26_1_23_0/}
}
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Prautzsch, H. On convex Bézier triangles. ESAIM: Modélisation mathématique et analyse numérique, Topics in computer aided geometric design , Tome 26 (1992) no. 1, pp. 23-36. https://www.numdam.org/item/M2AN_1992__26_1_23_0/

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