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Darai, Donja; Grätz, Silvia (2013). Attraction and cooperative behavior. Working paper series / Department of Economics 82, University of Zurich.
Grätz, Silvia. Reciprocity, Institutions, and Cooperation. 2012, University of Zurich, Faculty of Economics.
Darai, Donja; Grätz, Silvia (2010). Determinants of Successful Cooperation in a Face-to-Face Social Dilemma. Working paper series / Socioeconomic Institute No. 1006, University of Zurich.