Columbia subject headings:
Harvard subject headings:
Austria--Economic conditions--Congresses.
Austria--Population--Congresses.
China--Economic conditions--Congresses.
China--Population--Congresses.
Older people--Care--Austria--Congresses.
Older people--Care--China--Congresses.
Social security--Austria--Congresses.
Social security--China--Congresses.
Princeton subject headings:
Austria--Economic conditions.
China--Economic conditions.
Social security--Austria--Congresses.
Social security--China--Congresses.