Submitted on: 20 October 2007.
Revised on: 08 November 2007.
Accepted on: 20 November 2007.
Papers-Revista de Sociologia---UNIV AUTONOMA BARCELONA
Submitted on: 19 January 2013.
Revised on: 04 March 2013.
Accepted on: 26 March 2013.
Papers-Revista de Sociologia---UNIV AUTONOMA BARCELONA
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Submitted on: 30 October 2006.
Revised on: 11 November 2006.
Accepted on: 06 December 2006.
Papers-Revista de Sociologia---UNIV AUTONOMA BARCELONA
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