Instrumentation Science & Technology, (2009), 37(2), pp. 230 to 240, INFRARED SPECTROMETRY IN DISCRIMINANT ANALYSIS OF LASER PRINTER AND PHOTOCOPY TONER ON QUESTIONED DOCUMENTS, Elena Gabriela Udriştioiu, A.A. Bunaciu, H.Y. Aboul-Enein and I. Gh. Tănase.