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Additional information
Novosibirsk. Translated fromSibirskiî Matematicheskiî Zhurnal, Vol. 41, No. 5, pp. 1076–1080 September–October, 2000.
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Ionin, V.K. Closed geodesics in simply connected Riemannian spaces of negative curvature. Sib Math J 41, 880–883 (2000). https://doi.org/10.1007/BF02674743
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DOI: https://doi.org/10.1007/BF02674743