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2. Fundamentals of optics;Jenkins,1976
3. The pigments and color of living human skin;Edwards;Am J Anat,1939
4. Reflection spectrophotometry: use in evaluation of skin pigmentary disturbances;Buckley;Arch Dermatol,1961
5. Optical radiation transfer in the human skin and applications in in vivo remittance spectroscopy;Anderson,1981