Columbia subject headings:
Boundary value problems--Congresses.
Differential equations, Elliptic--Congresses.
Nets (Mathematics)--Congresses.
Harvard subject headings:
Boundary value problems--Congresses
Iterative methods (Mathematics)--Congresses.
Princeton subject headings:
Boundary value problems--Congresses.
Differential equations, Elliptic--Congresses.
Nets (Mathematics)--Congresses.