Fonte:
http://www.dre.pt/gratis/dd2s/20070219.2S035A0000S03.C.asp
http://www.dre.pt/pdf1sdip/2007/02/03600/12681270.PDF
http://www.dre.pt/pdf1sdip/2007/02/03600/12701273.PDF
http://www.dre.pt/pdf2sdip/2007/02/036000000/0441504417.pdf
