@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}, zbl = {0072.43802}, mrnumber = {87449}, language = {fr}, url = {www.numdam.org/item/AIHP_1956__15_2_123_0/} }
Cap, F. Le principe de Fermat dans les milieux absorbants non-homogènes. Annales de l'institut Henri Poincaré, Tome 15 (1956) no. 2, pp. 123-131. http://www.numdam.org/item/AIHP_1956__15_2_123_0/