1. Questioned document examination;Brunelle,2002
2. Ink analysis;Brunelle,2000
3. Guide for writing ink identification;ASTM Standard E 1789-04,2008
4. Standard guide for test methods for forensic writing ink comparison;ASTM Standard E 1422-05,2008
5. The parameters of ballpen ink examinations;Crown;J. Forensic Sci.,1976