Fonte:
http://www.dgsi.pt/jsta.nsf/0/5f782aaae35caebf802575f300451eeb?OpenDocument
http://www.dgsi.pt/jsta.nsf/0/81539e61710432f8802575f30044a308?OpenDocument
http://www.dgsi.pt/jsta.nsf/0/88b01606fa8f31b3802575f300355bb1?OpenDocument
