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Multiple solutions of a bifurcation problem. (English) Zbl 0435.35012
Bifurcation and nonlinear eigenvalue problems, Proc., Villetaneuse/France 1978, Lect. Notes Math. 782, 42-60 (1980).

35B32 Bifurcations in context of PDEs
47J10 Nonlinear spectral theory, nonlinear eigenvalue problems
58C99 Calculus on manifolds; nonlinear operators
35J99 Elliptic equations and elliptic systems