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Research supported by the “Sonderforschungsbereich Theoretische Mathematik (SFB 40)” at the University of Bonn
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Thorbergsson, G. Closed geodesics on non-compact Riemannian manifolds. Math Z 159, 249–258 (1978). https://doi.org/10.1007/BF01214574
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DOI: https://doi.org/10.1007/BF01214574