Literatur
P. Hartman, Ordinary Differential Equations, Birkhäuser, Stuttgart 1982.
CA. Swanson, Comparison and Oscillation Theory of Linear Differential Equations, Academic Press, New York 1968.
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Herold, H. Vergleichssätze vom Sturmschen Typ.. Results. Math. 16, 82–88 (1989). https://doi.org/10.1007/BF03322646
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DOI: https://doi.org/10.1007/BF03322646