Directional reflectance and emissivity of an opaque surface. Nicodemus, F. E. Applied Optics, 4(7):767, 1965.
Directional reflectance and emissivity of an opaque surface [link]Paper  bibtex   
@article{nicodemus_directional_1965,
	title = {Directional reflectance and emissivity of an opaque surface},
	volume = {4},
	url = {http://ao.osa.org/abstract.cfm?URI=ao-4-7-767},
	number = {7},
	journal = {Applied Optics},
	author = {Nicodemus, Fred E.},
	year = {1965},
	pages = {767}
}

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