1. “Technology recognition systems homepage,” http://www.betac.com/~imagemap/subs?-155,150, 1997.
2. J. Rice, “Veincheck homepage,” http://innotts.co.uk/~joerice/, 1997.
3. M. Burge and W. Burger, “Ear biometrics for machine vision,” in 21 st Workshop of Austrian Association for Pattern Recognition, http://www.cast.uni-linz.ac.at/st/vision/-Papers/oagm-97/, (Hallstatt), ÖAGM, Verlag R Oldenbourg, May 1997.
4. Federal Bureau of Investigation Educational Internet Publication, “DNA testing,” http://www.fbi.gov/kids/dna/dna.htm, 1997.
5. A. Moenssens, Fingerprint Techniques. Chilton Book Company, London, 1971.