Fonte:
http://info.portaldasfinancas.gov.pt/NR/rdonlyres/15FCCD76-E558-4015-BDDD-96FBCB05ADCF/0/inf%201786.pdf
http://info.portaldasfinancas.gov.pt/NR/rdonlyres/892A96CA-2FDA-427D-B5E8-2AA25C41F152/0/inf1671.pdf