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Communicated by L. Cesari
This research was supported in part by the National Aeronautics and Space Administration under Grant No. NGR-40-002-015, in part by the United States Army Research Office, Durham, under Contract No. DA-31-124-ARO-D-270 and in part by the National Science Foundation under Grant No. GP-4362.
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Hale, J.K. Periodic solutions of a class of hyperbolic equations containing a small parameter. Arch. Rational Mech. Anal. 23, 380–398 (1967). https://doi.org/10.1007/BF00276781
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DOI: https://doi.org/10.1007/BF00276781