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Dedicated to Professor Otto Haupt with best wishes on his 100th birthday
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Neuman, F. Global theory of ordinary linear homogeneous differential equations in the real domain—II. Aeq. Math. 34, 1–22 (1987). https://doi.org/10.1007/BF01840120
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DOI: https://doi.org/10.1007/BF01840120