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Palamides, A.P. Existence and multiplicity of positive and negative solutions for higher-order multi-point Sturm-Liouville boundary value problems. Differ Equ Dyn Syst 16, 121–143 (2008). https://doi.org/10.1007/s12591-008-0008-0
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DOI: https://doi.org/10.1007/s12591-008-0008-0