By Jean-Marie Chauvet, Eliette Brunel Deschamps, Christian Hillaire, Paul G. Bahn
By Nicholas Wade
By Ben Cowell
By Steve Chapman
By Peter Masters
By Richard Morris
By Markham, Robert
By E. Cairns, M. Roe
By Paul Hopper
By Paul Hopper (University of Brighton)
By Rudgley, Richard
By David Christian
By Miranda J Green
By Con Coughlin
By Frank Furedi (University of Kent, UK)
By Wilson, Ian Graham