Fonte:
http://info.portaldasfinancas.gov.pt/NR/rdonlyres/1028E6A8-3D0B-4C16-8CA0-A79FF507FA96/0/IVE%20206%20-%203718_2009%20-%20Sisas.pdf
http://info.portaldasfinancas.gov.pt/NR/rdonlyres/9457FA20-443D-46EF-BB6E-14EFE80D2DB5/0/IVE%20431%20-%201914_2009%20-%20CIRE.pdf
http://info.portaldasfinancas.gov.pt/NR/rdonlyres/20FB4926-D56F-4024-9049-081243C68F64/0/IVE%201170%20-%203720_2010.%20validade%20do%20DUC.pdf
http://info.portaldasfinancas.gov.pt/NR/rdonlyres/3EEBD2C9-2D06-4F6D-A38B-8B4B38DFE2E1/0/IVE%20765%20-%201496_2010%20-%20base%20tributavel%20IMT.pdf
