Paul, Mango; Clough, Bryan (February 1993). "The Bulgarian connection: many of the smartest viruses poised to destroy US computers can be traced to a single bored Eastern European hacker". Discover. Vol. 14, no. 2. Illustrations by Jonathon Rosen. Chicago, United States: Kalmbach Publishing Company / Disney Magazine Publishing. pp. 54–61. eISSN2169-5407. ISSN0274-7529. ProQuest205987735, 205984372 (accession number 01360767), EBSCOhost9302090298.
Paul, Mango; Clough, Bryan (February 1993). "The Bulgarian connection: many of the smartest viruses poised to destroy US computers can be traced to a single bored Eastern European hacker". Discover. Vol. 14, no. 2. Illustrations by Jonathon Rosen. Chicago, United States: Kalmbach Publishing Company / Disney Magazine Publishing. pp. 54–61. eISSN2169-5407. ISSN0274-7529. ProQuest205987735, 205984372 (accession number 01360767), EBSCOhost9302090298.
Paul, Mango; Clough, Bryan (February 1993). "The Bulgarian connection: many of the smartest viruses poised to destroy US computers can be traced to a single bored Eastern European hacker". Discover. Vol. 14, no. 2. Illustrations by Jonathon Rosen. Chicago, United States: Kalmbach Publishing Company / Disney Magazine Publishing. pp. 54–61. eISSN2169-5407. ISSN0274-7529. ProQuest205987735, 205984372 (accession number 01360767), EBSCOhost9302090298.