Gates, Scott; Håvard Hegre; Ranveig Gissinger; Nils Petter Gleditsch; Nils Petter Gleditsch; Håvard Hegre; & Ranveig Gissinger (1998) Timing the Changes in Political Structures. A New Polity Database, Journal of Conflict Resolution 42(2): 231–242.
Research Professor; Professor Emeritus of Political Science, NTNU
Research Professor. Editor, International Area Studies Review
The Peace Research Institute Oslo (PRIO) conducts research on the conditions for peaceful relations between states, groups and people.