Fonte:
http://www.dgaiec.min-financas.pt/NR/rdonlyres/55A9361F-EFBE-492D-AE94-F760F45BD4EF/0/codigo_iec_vrs_2009_01_08.pdf
http://www.dgaiec.min-financas.pt/pt/destaques/stada_importacao/NEWS_revogacao_selo_operacoes_aduaneiras.htm
http://www.dgaiec.min-financas.pt/NR/rdonlyres/6AF1DDF6-85C7-47E8-9218-938E7629E06F/0/Circular_n_02_2009_II.pdf
http://www.dgaiec.min-financas.pt/NR/rdonlyres/96189CFD-EDD8-4EDE-B83D-89AC4ECD7403/0/Circular_n_03_2009_II.pdf
