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This paper was completed while the author was at the Mathematisches Institut der Universität Bonn, supported by the CNPq-GMD program
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Ferraris, C.J. On the resolution of degenerate closed geodesics. Math Z 173, 223–228 (1980). https://doi.org/10.1007/BF01159660
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DOI: https://doi.org/10.1007/BF01159660