Diffuse and Specular Reflectance from Rough Surfaces. Ginneken, B. v., Stavridi, M., & Koenderink, J. J. Applied Optics, 37(1):130--139, 1998.
Diffuse and Specular Reflectance from Rough Surfaces [link]Paper  bibtex   
@article{ginneken_diffuse_1998,
	title = {Diffuse and {Specular} {Reflectance} from {Rough} {Surfaces}},
	volume = {37},
	url = {http://ao.osa.org/abstract.cfm?URI=ao-37-1-130},
	number = {1},
	journal = {Applied Optics},
	author = {Ginneken, Bram van and Stavridi, Marigo and Koenderink, Jan J.},
	year = {1998},
	keywords = {Optics at surfaces, Reflection},
	pages = {130--139}
}

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