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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     title = {Complex entropy for dynamical systems},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {891--902},
     year = {1991},
     publisher = {Gauthier-Villars},
     volume = {55},
     number = {4},
     mrnumber = {1144106},
     zbl = {0748.58009},
     language = {en},
     url = {https://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. https://www.numdam.org/item/AIHPA_1991__55_4_891_0/

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