Fonte:
http://info.portaldasfinancas.gov.pt/NR/rdonlyres/1F133783-99A7-4A4B-8E28-131FDA759344/0/tratado%201937.pdf
http://info.portaldasfinancas.gov.pt/NR/rdonlyres/30F40C3D-62C6-45A9-A7BA-6A0B32FCBEEB/0/tratado%201899.pdf
http://info.portaldasfinancas.gov.pt/NR/rdonlyres/487DF376-AAF4-4EED-9755-A88CB755AE1F/0/tratado%201852.pdf
http://info.portaldasfinancas.gov.pt/NR/rdonlyres/C2641F35-7C7D-43B8-A631-13E93EDD2846/0/tratado%201849.pdf
