Columbia subject headings:
Harvard subject headings:
Balkan Peninsula--Emigration and immigration--Congresses.
Belgrade (Serbia)--Emigration and immigration--Congresses.
Belgrade (Serbia)--Emigration and immigration--Government policy--Congresses.
Border crossing--Balkan Peninsula--Congresses.
European Union countries--Emigration and immigration--Congresses.
European Union countries--Emigration and immigration--Government policy--Congresses.
Refugees--European Union countries--Congresses.
Refugees--Serbia--Belgrade--Congresses.
Refugees--Serbia--Belgrade--Social conditions--Congresses.
Princeton subject headings:
Balkan Peninsula--Ethnic relations.
Human rights--Balkan Peninsula.
Refugees--Balkan Peninsula.
Refugees--Serbia--Belgrade--21st century.