Columbia subject headings:
Balkan Peninsula--History--1989---Congresses.
Crisis management--Balkan Peninsula--Congresses.
Organization for Security and Co-operation in Europe--Congresses.
Harvard subject headings:
Balkan Peninsula--History--1989---Congresses.
Crisis management--Balkan Peninsula--Congresses.
Organization for Security and Co-operation in Europe--Congresses.
Princeton subject headings:
Balkan Peninsula--History--1989---Congresses.
Crisis management--Balkan Peninsula--Congresses.
Organization for Security and Co-operation in Europe--Congresses.