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Communicated by L. Cesari
This research was supported by National Science Foundation under Grant Number GP-1638.
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Yoshizawa, T. Extreme stability and almost periodic solutions of functional-differential equations. Arch. Rational Mech. Anal. 17, 148–170 (1964). https://doi.org/10.1007/BF00253052
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DOI: https://doi.org/10.1007/BF00253052