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The work of the first named author was supported by the National Science Foundation under Grant G-P-8832.
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Fink, A.M., Mary, D.F.S. A generalized sturm comparison theorem and oscillation coefficients. Monatshefte für Mathematik 73, 207–212 (1969). https://doi.org/10.1007/BF01300536
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DOI: https://doi.org/10.1007/BF01300536