Consult:
- Notice no. 6623/2005, of 11 of July https://www.anacom.pt/render.jsp?contentId=1022974
- National Frequency Allocation Plan 2005 https://www.anacom.pt/render.jsp?contentId=656441
- National Frequency Allocation Plan (NFAP) https://www.anacom.pt/render.jsp?contentId=1093098