Multiple positive solutions to fourth-order singular boundary-value problems in abstract spaces.
Multiplicity of solutions for some fourth-order -point boundary-value problems.
Multiple solutions for fourth order -point boundary value problems with sign-changing nonlinearity.
Monotone iterative techniques and a periodic boundary value problem for first-order differential equations with a functional argument.
Multiple positive solutions for a class of nonresonant singular boundary-value problems.
Multiplicity results using bifurcation techniques for a class of fourth-order -point boundary value problems.
A necessary and sufficient condition for the existence of positive solutions to singular boundary-value problems of higher order differential equations.
Positive solutions for systems of nonlinear singular differential equations.
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