Columbia subject headings:
Austria--Defenses.
Austria--Foreign relations--21st century.
Germany--Defenses.
Germany--Foreign relations--1990-
National security--Austria.
National security--Germany.
National security--Switzerland.
Switzerland--Defenses.
Switzerland--Foreign relations--21st century.
Harvard subject headings:
Austria--Defenses.
Austria--Foreign relations--21st century.
Germany--Defenses.
Germany--Foreign relations--1990-
National security--Austria.
National security--Germany
National security--Switzerland
Switzerland--Defenses.
Switzerland--Foreign relations--21st century.
Princeton subject headings:
Internal security--Austria.
Internal security--Germany.
Internal security--Switzerland.
International relations.