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2. Political Parties: A Behavioral Analysis;Eldersveld,1964
3. The Logics of Party Formation: Ecological Politics in Belgium and West Germany;Kitschelt,1989
4. Beyond the European Left: Ideology and Political Action in the Belgian Ecology Parties;Kitschelt,1990
5. The Left Unraveled: Social Democracy and the New Left Challenge in Britain and West Germany;Koelble,1991