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Communicated by H. Görtler
This research was supported in part by National Science Foundation Grant No. GP 19712 with the University of Colorado.
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Sather, D. Nonlinear gradient operators and the method of lyapunov-schmidt. Arch. Rational Mech. Anal. 43, 222–244 (1971). https://doi.org/10.1007/BF00251454
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DOI: https://doi.org/10.1007/BF00251454