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This research was supported by the Air Force Office of Scientific Research.
Acknowledgement. The author wishes to acknowledge the help he has received with the work on and writing of this paper fromJ. J. Schäffer in numerous discussions and a lengthy correspondence. This paper was completely revised afterSchäffer made the manuscript of [14] available to the author.
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Hartman, P. On dichotomies for solutions ofn-th order linear differential equations. Math. Ann. 147, 378–421 (1962). https://doi.org/10.1007/BF01452423
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DOI: https://doi.org/10.1007/BF01452423