Columbia subject headings:
Differential equations, Nonlinear--Congresses.
Differential equations, Partial--Congresses.
Engineering mathematics--Congresses.
Harvard subject headings:
Differential equations, Nonlinear--Congresses.
Differential equations, Partial--Congresses.
Engineering mathematics--Congresses.
Princeton subject headings:
Differential equations, Nonlinear--Congresses.
Differential equations, Partial--Congresses.
Engineering mathematics--Congresses.