1. Acree MA (1999) Is there a gender difference in fingerprint ridge density? For Sci Int 102:35–44
2. Adair TW, Lemay J, McDonald A, Shaw R, Tewes R (2007) The Mount Bierstadt study: an experiment in unique damage formation in footwear. J Forensic Ident 57:199–205
3. Ahmed AA, Osman S (2016) Topological variability and sex differences in fingerprint ridge density in a sample of the Sudanese population. J For Legal Med 42:25–32
4. Anon (2007) Police set up footwear database to rival DNA evidence. Daily Mail. www.dailymail.co.uk/news/article-432276/Police-set-footwear-database-rival-DNA-evidence.html#ixzz5FfvJgeAW
5. Barker SL, Scheuer JL (1998) Predictive value of human footprints in a forensic context. Medicine Sci Law 38(4):341–346