Columbia subject headings:
Polyhedra--Congresses.
Singularities (Mathematics)--Congresses.
Surfaces--Congresses.
Harvard subject headings:
Mathematical physics.
Physics.
Polyhedra--Congresses.
Singularities (Mathematics)--Congresses.
Surfaces--Congresses.
Princeton subject headings:
Polyhedra--Congresses.
Singularities (Mathematics)--Congresses.
Surfaces--Congresses.