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2. The Identification of Dyes Used in Various Types of Inks by Thin Layer Chromatography;Verma;American Ink Maker,1966
3. Selective Wavelength Examination Applied to Ink Differentiation Problems;Packard;Journal of Forensic Sciences,1964
4. A Comparative Analysis of Dichroic Filter Viewing, Reflected Infrared and Infrared Luminescence Applied to Ink Differentiation Problems;Dick;Journal of Forensic Sciences,1970
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