Columbia subject headings:
Nonlinear theories--Congresses.
Phonons--Congresses.
Solids--Congresses.
Solitons--Congresses.
Harvard subject headings:
Nonlinear theories--Congresses.
Phonons--Congresses.
Solids--Congresses
Solitons--Congresses.
Princeton subject headings:
Nonlinear theories--Congresses.
Phonons--Congresses.
Solids--Congresses.
Solitons--Congresses.