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De Neve, Jan-Emmanuel, Christakis, Nicholas A., Fowler, James H. and Frey, Bruno S. (2012) Genes, economics, and happiness. Journal of Neuroscience, Psychology, and Economics, 5 (4). pp. 193-211. ISSN 1937-321X
Frey, Bruno S. (2009) A new concept of European federalism. LSE 'Europe in Question' discussion paper series (03/2009). London School of Economics and Political Science, London.