John A. Gregory, Jianwei Zhou. Convexity of Bézier nets on sub-triangles. Computer Aided Geometric Design, 8(3):207-211, 1991. [doi]
@article{GregoryZ91,
title = {Convexity of Bézier nets on sub-triangles},
author = {John A. Gregory and Jianwei Zhou},
year = {1991},
doi = {10.1016/0167-8396(91)90004-U},
url = {http://dx.doi.org/10.1016/0167-8396(91)90004-U},
researchr = {https://researchr.org/publication/GregoryZ91},
cites = {0},
citedby = {0},
journal = {Computer Aided Geometric Design},
volume = {8},
number = {3},
pages = {207-211},
}