AcknowledgmentsWe are grateful to Alan Fedeli for establishing and overseeing IBM's central virus reporting agency, to Ralph Langham, Julian Banks, and Yann Stanczewski for collecting the data presented here, and to Dave Chess for his help in analyzing it. The kill signal idea owes its existence and its name to Bill Arnold. We also thank Peter Tippett of Certus (a division of Symantec) for supplying us with the raw data from the 1991 Dataquest survey.
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