Fonte:
http://dre.pt/pdf1sdip/2009/02/03600/0120901209.pdf
http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2006:379:0005:0010:PT:PDF
http://dre.pt/pdf2sdip/2009/02/036000000/0710007101.pdf
