His thesis Militæretaten og "den indre fiende" fra 1905 til 1940. Hemmelige sikkerhetsstyrker i Norge sett i et skandinavisk perspektiv explored the military precautions against "inner enemies"—defined as revolutionary segments—between the 1905 Norwegian independence and the Second World War, against a Scandinavian backdrop.
Sweden | Norway | Soviet Union | European Union | Union Army | rugby union | Union | International Telecommunication Union | trade union | Union (American Civil War) | Union Pacific Railroad | England national rugby union team | American Civil Liberties Union | Wales national rugby union team | New Zealand national rugby union team | Ireland national rugby union team | Western Union | Sweden national football team | Scotland national rugby union team | International Astronomical Union | Norway national football team | Georgia national rugby union team | Dissolution of the Monasteries | Trade union | International Union for Conservation of Nature | Border Union Railway | France national rugby union team | United States national rugby union team | South Africa national rugby union team | Communist Party of the Soviet Union |