Columbia subject headings:
Research--Congresses.
Socialism--Congresses.
System theory--Congresses.
Harvard subject headings:
Research--Congresses
Socialism--Congresses
System theory--Congresses
Princeton subject headings:
Communism and science.
Research, Industrial--Communist countries--Congresses.
Research--Communist countries--Congresses.
Research--Psychological aspects.
Science--Communist countries--Congresses.