Michael Ashikhmin, Peter Shirley. An Anisotropic Phong BRDF Model. J. Graphics Tools, 5(2):25-32, 2000. [doi]
@article{AshikhminS00,
title = {An Anisotropic Phong BRDF Model},
author = {Michael Ashikhmin and Peter Shirley},
year = {2000},
doi = {10.1080/10867651.2000.10487522},
url = {http://dx.doi.org/10.1080/10867651.2000.10487522},
researchr = {https://researchr.org/publication/AshikhminS00},
cites = {0},
citedby = {0},
journal = {J. Graphics Tools},
volume = {5},
number = {2},
pages = {25-32},
}