Many thanks to all who replied. The source can be found at: >http://www.mailbase.ac.uk/cgi-bin/mseek?archives&lis-link&1997-07&315314&317016 Wendy Wendy Buckle Head of Library Services Royal Military College of Science (Cranfield University) Shrivenham Swindon SN6 8LA ********************************** Tel: 01793 - 785763 Fax: 01793 - 785555 email: [log in to unmask] ********************************** %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%