Columbia subject headings:
Commutative algebra--Congresses.
Geometry, Algebraic--Congresses.
System analysis--Congresses.
Harvard subject headings:
Commutative algebra--Congresses.
Geometry, Algebraic--Congresses.
System analysis--Congresses.
Princeton subject headings:
Commutative algebra--Congresses.
Geometry, Algebraic--Congresses.
System analysis--Congresses.