In the spectroscopy of highly irregular samples, the spectral distortions introduced by absorbance averaging over nonuniform samples are further compounded by refractive and scattering beam distortion effects.
Tomas Hirschfeld and Charles Cody, "Measurement of Highly Nonuniform Samples by Fourier Transform Infrared Spectroscopy," Appl. Spectrosc. 31, 551-552 (1977)
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