| http://www.w3.org/ns/prov#value | - Further, there are a method of measuring an absorbance difference using pulsed light, a method further utilizing a principle of dual-wavelength spectroscopy, and a method of measuring an absorbance optical density using light having three or more kinds of wavelengths, but in either case, since a method of measuring an absorbance in which an optical pathlength in a scattering medium is assumed to b
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