1. V. McLellan, “Computer Systems Under Siege”, The New York Times, January 17, 1988.
2. Internal IBM documents.
3. E.H. Spafford, “The Internet Worm: An Analysis,” Purdue University Technical Report CSD-TR-823, November 28, 1988.
4. J.E. White, “Telescript technology: the foundation for the electronic market-place,” General Magic Inc., Mountainview, California, 1994.
5. Y. Goldberg et al., “Active Mail: A Framework for Implementing Groupware”, in Proceedings of CSCW’ 92, Toronto 1992.