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Communicated by L. Cesari
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Kazarinoff, N.D. Asymptotic theory of second order differential equations with two simple turning points. Arch. Rational Mech. Anal. 2, 129–150 (1958). https://doi.org/10.1007/BF00277924
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DOI: https://doi.org/10.1007/BF00277924