utenom de faste seriene
"The contribution of imprisonment and release to fatal overdose among a cohort of Norwegian drug abusers". Forfattere: Ødegård, Amundsen, Bo Kielland og Kristoffersen, artikkel i Addiction Research and Theory, vol. 18 no. 1 2010 , s. 51 - 58
"Understanding the Process of Online Grooming: The Behavior of Men who Target Young People Online in Norway" Forfattere: Gottschalk og Kristoffersen, artikkel i International Journal of Digital Crime and Forensics, Vol. 1, Issue 4.
RETUR- En nordisk undersøgelse af recidiv blandt klienter i kriminalforsorgen (pdf). Ved Ragnar Kristoffersen.