1. Agarwal, A., Chakravarthy, B., Jain, R.K., Rao, M.S.: Computer based Decipherment of Obliterations in Questioned Documents. In: Proc. National Conference on Document Analysis and Recognition, NCDAR 2003, Mandya (2003)
2. Haritha, D., Bhagvati, C.: Classification of Liquid and Viscous inks using HSV Colour Space. In: Int. Conf. on Document Analysis and Recognition (ICDAR 2005), Seoul, Korea (2005)
3. Brunelle, R.: Questioned Document Examination in Forensic Science Handbook. Applied Optical Journal 5, 1361–1364 (1966)
4. Doherty, P.E.: The Classification of Inkjet Printers and Ink. In: Proc. 57th ASQDE Annual meeting (1999)
5. Ellen, D.: The Scientific Examination of Documents, 2nd edn. Taylor & Francis, Abington (1997)