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Positive solutions of semilinear elliptic problems. (English) Zbl 0506.35038
Differential equations, Proc., Sao Paulo 1981, Lect. Notes Math. 957, 34-87 (1982).

35J65 Nonlinear boundary value problems for linear elliptic equations
35A05 General existence and uniqueness theorems (PDE) (MSC2000)
35B50 Maximum principles in context of PDEs
35P30 Nonlinear eigenvalue problems and nonlinear spectral theory for PDEs