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This research was supported by the SFB 72 of the Deutsche Forschungsgemeinschaft
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Struwe, M. Infinitely many critical points for functionals which are not even and applications to superlinear boundary value problems. Manuscripta Math 32, 335–364 (1980). https://doi.org/10.1007/BF01299609
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DOI: https://doi.org/10.1007/BF01299609