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This research was supported by the Sonderforschungsbereich 72 of the Deutsche Forschungsgemeinschaft
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Struwe, M. Multiple solutions of differential equations without the Palais-Smale condition. Math. Ann. 261, 399–412 (1982). https://doi.org/10.1007/BF01455458
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DOI: https://doi.org/10.1007/BF01455458