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Rüssmann, H.: Über einen Vergleichssatz für lineare gewöhnliche Differentialgleichungen. Math. Z.112, 219–220 (1969).
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Research supported by a grant of the National Science Foundation, NSF GP 11219.
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Kreith, K. A comparison theorem forn-th order differential equations. Math Z 115, 357–358 (1970). https://doi.org/10.1007/BF01131307
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DOI: https://doi.org/10.1007/BF01131307