@article{AIHPA_1988__49_3_297_0,
     author = {Davies, P. C. W.},
     title = {Cosmological event horizons, entropy and quantum particles},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {297--306},
     publisher = {Gauthier-Villars},
     volume = {49},
     number = {3},
     year = {1988},
     mrnumber = {988429},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPA_1988__49_3_297_0/}
}