1. Electoral institutions, cleavage structures, and the number of parties;Amorim Neto;American Journal of Political Science,1997
2. The psychological impact of electoral laws: measuring Duverger's elusive factor;Blais;British Journal of Political Science,1991
3. Making Votes Count: Strategic Coordination in the World's Electoral Systems;Cox,1997
4. Political Parties: Their Organization and Activity in the Modern State;Duverger,1951
5. Econometric Analysis;Greene,1993