no. 4
Complex entropy for dynamical systems
Annales de l'I.H.P. Physique théorique, Tome 55 (1991) no. 4, pp. 891-902. 
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     number = {4},
     year = {1991},
     mrnumber = {1144106},
     zbl = {0748.58009},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1991__55_4_891_0/}
}
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Delyon, F.; Foulon, P. Complex entropy for dynamical systems. Annales de l'I.H.P. Physique théorique, Tome 55 (1991) no. 4, pp. 891-902. http://www.numdam.org/item/AIHPA_1991__55_4_891_0/

[1] F. Delyon and P. Foulon, Adiabatic Theory, Lyapunov Exponents and Rotation Number for Quadratic Hamiltonians, J. Stat. Phys., Vol. 49, 3/4, 1987, pp. 829-840. | MR | Zbl

[2] P. Foulon, Géométrie des équations différentielles du second ordre, Ann. Inst. Henri Poincaré, 45, 1986, pp. 1-28. | Numdam | MR | Zbl

[3] P. Foulon, Estimation de l'entropie des systèmes lagrangiens sans points conjugués, Preprint, 1985.

[4] Ya.B. Pesin, Geodesic Flows with Hyperbolic Behavior of the Trajectories and Objects Connected with Them, Russian Math. Surveys, Vol. 36, 4, 1981, pp. 1-59. | MR | Zbl

[5] Ya.B. Pesin, Formulae for the Entropy of a Geodesic Flow on a Compact Riemannian Manifold Without Conjugate Points, Mat. Zametki, Vol. 24, 1978, pp. 553-570, Math. Notes, Vol. 24, 1978, pp. 796-805. | MR | Zbl

[6] D. Ruelle, Ergodic Theory of Differentiable dynamical Systems, Publ. Math. I.H.E.S., Vol. 50, 1979, pp. 27-58. | Numdam | MR | Zbl

[7] D. Ruelle, Rotation Number for Diffeomorphisms and Flows, Ann. Inst. Henri Poincaré, Phys. Théor., Vol. 42, 1985, pp. 109-115. | Numdam | MR | Zbl