[Cohen92] F. Cohen, Defense-In-Depth Against Computer Viruses, IFIP-TC11, Computers and Security, V11#2?, 1992. [This paper describes how a system based on defense-in-depth against computer viruses was constructed and how it successfully defended against new viruses for a period of several years without modification. This system has now withstood more than 7 years of new viruses without failure.]