Borgersrud's master's thesis from 1975 disclosed sensitive information regarding military personnel and organization prior to World War II and their possible effects on military preparedness prior to the invasion of Norway by Nazi Germany. As a student he was threatened with being prosecuted if he published his thesis. Nevertheless, Borgersrud eventually published three books with material from his work under the pseudonym "Ottar Strømme": "Stille mobilisering", "Unngå å irritere fienden" and "Den hemmelige hæren". In 1978, he also published the first volume of the secret report from "Den militære undersøkelseskommisjonen av 1946", under the same pseudonym.