Columbia subject headings:
Catastrophes (Mathematics)
Grammar, Comparative and general--Phonology.
Phonetics.
Structural linguistics.
Harvard subject headings:
Catastrophes (Mathematics)
Grammar, Comparative and general--Phonology
Mathematical linguistics.
Phonetics
Structural linguistics.
Princeton subject headings:
Catastrophes (Mathematics)
Grammar, Comparative and general--Phonology.
Phonetics.
Structural linguistics.