Columbia subject headings:
Differential equations--Congresses.
Mathematical analysis--Congresses.
Nonlinear mechanics--Congresses.
Harvard subject headings:
Differential equations--Congresses.
Mathematical analysis--Congresses.
Nonlinear mechanics--Congresses.
Princeton subject headings:
Differential equations--Congresses.
Mathematical analysis--Congresses.
Nonlinear mechanics--Congresses.