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Work partially supported by the program Sonderforschungsbereich “Theoretische Mathematik” at the University of Bonn
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Bangert, V. Closed geodesics on complete surfaces. Math. Ann. 251, 83–96 (1980). https://doi.org/10.1007/BF01420283
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DOI: https://doi.org/10.1007/BF01420283