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Ezrow, Lawrence; De Vries, Catherine; Steenbergen, Marco; Edwards, Erica (2011). Mean voter representation and partisan constituency representation: Do parties respond to the mean voter position or to their supporters? Party politics, 17(3), pp. 275-301. London: Sage Publications 10.1177/1354068810372100
Hooghe, Liesbet; Bakker, Ryan; Brigevich, Anna; de Vries, Catherine; Edwards, Erica; Marks, Gary; Rovny, Jan; Steenbergen, Marco; Vachudova, Milada (2010). Reliability and validity of the 2002 and 2006 Chapel Hill expert surveys on party positioning. European journal of political research, 49(5), pp. 687-703. Oxford: Blackwell Publishing 10.1111/j.1475-6765.2009.01912.x
