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This paper was prepared under the program “Sonderforschungbereich Theoretische Mathematik” at Bonn University.
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Tsagas, G. The closed geodesics of a special manifold. Math. Ann. 199, 155–159 (1972). https://doi.org/10.1007/BF01431420
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DOI: https://doi.org/10.1007/BF01431420