Columbia subject headings:
Catastrophes (Mathematics)
Language and languages--Variation.
Semantics--Mathematical models.
Thom, René, 1923-2002.
Harvard subject headings:
Catastrophes (Mathematics)
Language and languages--Variation
Semantics--Mathematical models
Thom, René, 1923-2002
Princeton subject headings:
Catastrophes (Mathematics)
Semantics--Mathematical models.
Thom, René, 1923-2002.