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Twin solutions to singular dirichlet problems
(Elsevier BV, 1999-12-01)
Existence results for differential equations with reflection of the argument
(Cambridge University Press (CUP), 1994-10-01)
Existence principles are given for systems of differential equations with reflection of the argument. These are derived using fixed point analysis, specifically the Nonlinear Alternative. Then existence results are deduced ...
Nonresonant nonlinear singular problems in the limit circle case
(Elsevier BV, 1996-02-01)