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Positive solutions to singular initial value problems with sign changing nonlinearities
(Elsevier BV, 1998-08-01)
Singular differential equations with linear and nonlinear boundary conditions
(Elsevier BV, 1998-02-01)
Existence results are established for the singular equation y " + f(t, y) = 0, where f is not a Caratheodory function. Our nonlinearity f is allowed to change sign.