1. Aardal, B., and Valen, H. Norwegian Election Study 1989 [computer file]. Norwegian Gallup Institute [producer]. Norwegian Social Science Data Services (NSD) [distributor].
2. Partisan Politics, Divided Government, and the Economy;Alesina,1995
3. Barometer elections in comparative perspective;Anderson;Electoral Studies,1996
4. Elections, coalitions, and legislative outcomes;Austen-Smith;American Political Science Review,1988
5. Electoral behavior and comparative politics;Barnes,1997