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Knezevic-Miljanovic, J. An Estimate of the First Eigenvalue in a Many-Point Boundary Value Problem. Differential Equations 39, 1802–1807 (2003). https://doi.org/10.1023/B:DIEQ.0000023561.85997.d6
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DOI: https://doi.org/10.1023/B:DIEQ.0000023561.85997.d6