Fonte:
http://www.dgsi.pt/jtcn.nsf/a10cb5082dc606f9802565f600569da6/74b0fcc974642cf980257487003d7448?OpenDocument
http://www.dgsi.pt/jtcn.nsf/a10cb5082dc606f9802565f600569da6/9506df2f8b64f52680257487003d7445?OpenDocument