Przemyslaw Kiciak. Computing normal vector Bézier patches. Computer Aided Geometric Design, 18(7):699-710, 2001. [doi]
@article{Kiciak01a,
title = {Computing normal vector Bézier patches},
author = {Przemyslaw Kiciak},
year = {2001},
doi = {10.1016/S0167-8396(01)00062-0},
url = {http://dx.doi.org/10.1016/S0167-8396(01)00062-0},
researchr = {https://researchr.org/publication/Kiciak01a},
cites = {0},
citedby = {0},
journal = {Computer Aided Geometric Design},
volume = {18},
number = {7},
pages = {699-710},
}