publicaciones seleccionadas artículo Excludability: A Laboratory Study on Forced Ranking in Team Production 2015 Counterterrorism Strategies in the Lab 2011 Reciprocity, Matching and Conditional Cooperation inTtwo Public Goods Games 2005 documento de trabajo An Experimental Analysis of Conditional Cooperation 2006-11 Reciprocity, Matching and Conditional Cooperation in Two Public Goods Games 2004