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2. Watson, C. A.; Carville, E.; Dikeman, E.; Daigger, G.; Booth, G. E.Evaluation of two infrared instruments for determining protein content of hard red winter wheat
3. Optical sphere paint and a working standard of reflectance;Grum;Appl. Optics,1968
4. Applications of Infrared Detectors,1971
5. Operational Amplifiers Design and Applications;Graeme,1971