1. George Mason University; Document Forensics Laboratory; Volgenau School of Engineering; Nguyen Engineering Building 4400 University Drive Fairfax 22030 VA
2. Department of Mathematics and Statistics; South Dakota State University; AME Building Box 2225 Brookings SD 57006 USA
3. Sciometrics LLC; The Gannon Technologies Group; 14150 Parkeast Circle Suite 140 Chantilly VA 20151
4. Federal Bureau of Investigation Laboratory Division; Counterterrorism and Forensic Science Research Unit; Quantico VA 22135