Columbia subject headings:
Harvard subject headings:
Political participation--Europe--Congresses.
Political participation--Greece--Congresses.
Political participation--Portugal--Congresses.
Portugal--Politics and government--21st century--Congresses.
Representative government and representation--Europe--Congresses.
Representative government and representation--Greece--Congresses.
Representative government and representation--Portugal--Congresses.
Princeton subject headings:
Political participation--Europe--Congresses.
Political participation--Greece--Congresses.
Political participation--Portugal--Congresses.
Portugal--Politics and government--21st century--Congresses.
Representative government and representation--Europe--Congresses.
Representative government and representation--Greece--Congresses.
Representative government and representation--Portugal--Congresses.