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Sponsored by the United States Army under Contract No. DAAG29-80-C-0041. This research has been partially supported by the Niels Stensen Stichting, Amsterdam.
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van Groesen, E.W.C. Applications of natural constraints in critical point theory to boundary value problems on domains with rotation symmetry. Arch. Math 44, 171–179 (1985). https://doi.org/10.1007/BF01194082
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DOI: https://doi.org/10.1007/BF01194082