V. P. Kong, B. H. Ong. Shape preserving approximation by spatial cubic splines. Computer Aided Geometric Design, 26(8):888-903, 2009. [doi]
@article{KongO09,
title = {Shape preserving approximation by spatial cubic splines},
author = {V. P. Kong and B. H. Ong},
year = {2009},
doi = {10.1016/j.cagd.2009.07.001},
url = {http://dx.doi.org/10.1016/j.cagd.2009.07.001},
researchr = {https://researchr.org/publication/KongO09},
cites = {0},
citedby = {0},
journal = {Computer Aided Geometric Design},
volume = {26},
number = {8},
pages = {888-903},
}