1. Directive 70/338/EC of the European Parliament and the Council of 27 July 1970; 1970.
2. Arreˆté 1987-11-02, Journal Officiel de la République Française 20 Novembre 1987; 1987 [in French].
3. Decreto Ministeriale 20 marzo 1979, Supplemento Ordinario alla Gazzetta Ufficiale No. 206 of 28 July 1979; 1979 [in Italian].
4. Real decreto 1367/2007, Boletín Oficial del Estado of 23 October 2007; 2007 [in Spanish].
5. Environmental City Regulations, Buttletí Oficial de la Província de Barcelona of 2 May 2011; 2011 [in Catalan].