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Translated from Matematicheskie Zametki, Vol. 24, No. 4, pp. 553–570, October, 1978.
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Pesin, Y.B. Equations for the entropy of a geodesic flow on a compact Riemannian manifold without conjugate points. Mathematical Notes of the Academy of Sciences of the USSR 24, 796–805 (1978). https://doi.org/10.1007/BF01099169
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DOI: https://doi.org/10.1007/BF01099169