Columbia subject headings:
Associative rings--Congresses.
Commutative rings--Congresses.
Modules (Algebra)--Congresses.
Harvard subject headings:
Associative rings--Congresses.
Commutative rings--Congresses.
Modules (Algebra)--Congresses.
Princeton subject headings:
Associative rings--Congresses.
Commutative rings--Congresses.
Modules (Algebra)--Congresses.