File:Appointment certificate for Franz Josef Popp 1917.jpg - Wikipedia
Joseph Popp and Karen Dodson - PACA
Dr. Popp, the first computer virus, and the purpose of human life: Studies in Crap gapes at Popular Evolution
Joseph POPP | Obituary | Regina Leader-Post
Franz Joseph Popp (1849-1907) - Find A Grave Memorial
Joseph Popp | Obituary | The Tribune Democrat
Joseph Popp | Department of Economics
The bizarre story of the inventor of ransomware - CNN
Joseph L. Popp Jr (Deceased), Eastlake, OH Ohio last lived in Helena, MT USA
Joseph Popp Archives - BlogIT
Robert Popp | Obituary | News and Tribune
David Joseph Popp : Lance Corporal from Minnesota, Vietnam War Casualty
Joseph Allen Popp - Home | Facebook
George Popp Obituary - New Albany, IN
Franz Josef Popp Story - Bio, Facts, Networth, Family, Auto, Home | Famous Founders | SuccessStory
The Strange History of Ransomware | by Alina Simone | Medium
The First Ransomware: A Strange Story
The Computer Virus That Haunted Early AIDS Researchers - The Atlantic
Joseph “Joe” Popp Jr. (1931-1996) - Find A Grave Memorial
The first ransomware came on a floppy disk and used AIDS as a hook – Triggered Reviews
Joseph Popp Obituary - Regina, SK
Joseph L. Popp Jr. Butterfly Conservatory
