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This research was supported by the Office of Scientific Research of the United States Air Force.
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Markus, L., Moore, R.A. Oscillation and disconjugacy for linear differential equations with almost periodic coefficients. Acta Math. 96, 99–123 (1956). https://doi.org/10.1007/BF02392359
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DOI: https://doi.org/10.1007/BF02392359