Michael S. Floater. A counterexample to a theorem about the convexity of Powell-Sabin elements. Computer Aided Geometric Design, 14(4):383-385, 1997. [doi]
@article{Floater97b,
title = {A counterexample to a theorem about the convexity of Powell-Sabin elements},
author = {Michael S. Floater},
year = {1997},
doi = {10.1016/S0167-8396(97)00003-4},
url = {http://dx.doi.org/10.1016/S0167-8396(97)00003-4},
researchr = {https://researchr.org/publication/Floater97b},
cites = {0},
citedby = {0},
journal = {Computer Aided Geometric Design},
volume = {14},
number = {4},
pages = {383-385},
}