Fonte:
http://www.dgci.min-financas.pt/NR/rdonlyres/4E0CF1F1-242B-43F5-924B-9AB13AC37A72/0/IV_A051_2003001_Compostagem.pdf
http://www.dgci.min-financas.pt/NR/rdonlyres/9F9418B8-B85D-4D6C-85BC-5DC42050DF40/0/IV-a509_2006220_Anexo_P.pdf
http://www.dgci.min-financas.pt/NR/rdonlyres/F810455E-27BA-400B-B117-EC015816A78C/0/IV_F0612004383_Facturacao_global.pdf
http://www.dgci.min-financas.pt/NR/rdonlyres/2F7BDEDF-D823-4800-BD00-69D37BC65968/0/IV-f061_2005221-Facturacao_global.pdf
