@article{AIHP_1956__15_2_123_0,
     author = {Cap, F.},
     title = {Le principe de {Fermat} dans les milieux absorbants non-homog\`enes},
     journal = {Annales de l'institut Henri Poincar\'e},
     pages = {123--131},
     publisher = {INSTITUT HENRI POINCAR\'E ET GAUTHIER-VILLARS},
     volume = {15},
     number = {2},
     year = {1956},
     mrnumber = {87449},
     zbl = {0072.43802},
     language = {fr},
     url = {http://archive.numdam.org/item/AIHP_1956__15_2_123_0/}
}