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Communicated by E. Leimanis
This work was sponsored by the U.S. Army Research Office, Durham.
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Proctor, T.G., Struble, R.A. Motion of two weakly coupled nonlinear oscillators. Arch. Rational Mech. Anal. 18, 293–303 (1965). https://doi.org/10.1007/BF00251668
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DOI: https://doi.org/10.1007/BF00251668