1. Oak
Ridge Institute for Science and Education, Federal Bureau of Investigation, Laboratory Division, 2501 Investigation Parkway, Quantico, Virginia 22135, United States
2. Department
of Mathematics and Statistics, South Dakota State University, Harding
Hall 213, Box 2220, Brookings, South Dakota 57007, United States
3. Counterterrorism
and Forensic Science Research Unit, Federal Bureau of Investigation, Laboratory Division, 2501 Investigation Parkway, Quantico, Virginia 22135, United States