Columbia subject headings:
Harvard subject headings:
Borderlands--Social aspects--Europe--Congresses.
Globalization--Europe--Congresses.
Regionalism--Europe--Congresses
Social integration--Europe--Congresses.
Princeton subject headings:
Borderlands--Balkan Peninsula.
Borderlands--Europe, Eastern.
Regionalism--Balkan Peninsula.
Regionalism--Europe, Eastern.
Social integration--Balkan Peninsula.
Social integration--Europe, Eastern.