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Nonresonant nonlinear singular problems in the limit circle case
(Elsevier BV, 1996-02-01)
Multiple solutions for the dirichlet second-order boundary value problem of nonsingular type
(Elsevier BV, 1999-04-01)
Positive solutions of singular and nonsingular fredholm integral equations
(Elsevier BV, 1999-12-01)