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