Generalization of the Lambertian model and implications for Machine Vision. Oren, M. & Nayar, S. K. International Journal of Computer Vision, 14(3):227-251, 1995.
bibtex   
@Article{Oren_1995_11300,
  author = {M. Oren and S. K. Nayar},
 journal = {International Journal of Computer Vision},
 number = {3},
 pages = {227-251},
 title = {Generalization of the {Lambertian} model and implications for {Machine Vision}},
 volume = {14},
 year = {1995},
 title_with_no_special_chars = {Generalization of the Lambertian model and implications for Machine Vision}
}

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