Columbia subject headings:
Democracy--Europe, Central--Congresses.
Democracy--Europe, Eastern--Congresses.
Plebiscite--Europe, Central--Congresses.
Plebiscite--Europe, Eastern--Congresses.
Referendum--Europe, Central--Congresses.
Referendum--Europe, Eastern--Congresses.
Harvard subject headings:
Democracy--Europe, Central--Congresses.
Democracy--Europe, Eastern--Congresses
Europe, Central--Politics and government--1989---Congresses.
Europe, Eastern--Politics and government--1989---Congresses.
Political participation--Europe, Central--Congresses.
Political participation--Europe, Eastern--Congresses.
Princeton subject headings:
Democracy--Europe, Central--Congresses.
Democracy--Europe, Eastern--Congresses.
Europe, Central--Politics and government--1989---Congresses.
Europe, Eastern--Politics and government--1989---Congresses.
Political participation--Europe, Central--Congresses.
Political participation--Europe, Eastern--Congresses.