AcknowledgmentsWe are grateful to William C. Arnold, David M. Chess and Steve H. Weingart for useful conversations on how computer viruses behave in the real world, and to Scott Kirkpatrick for encouraging our interest in analytic and modelling approaches to this problem. We thank Paula K. Sweeney, David W. Levine and Paul J. Fink, Jr. for their assistance in harnessing the power of several IBM RISC System 6000 computers. In combination with a few IBM 3090s, the resultant 300 MIPS performance enabled our simulations to be completed in a few weeks.
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