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- Language: Spanish
- Year: 2008
- Author: Oliver Boyd-Barrett
- Language: English
- Year: 2010
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- Year: 2008
- Author: Badia Joan Brugarolas Camps Núria Grifoll Jordi
- Language: Catalan
- Year: 2012
- Author: Catalunya. Departament de Política Territorial i Obres Públiques
- Language: English
- Year: 2001