@article{TSG_1991__S9__25_0,
     author = {Besson, G\'erard},
     title = {Ergodicit\'e du flot g\'eod\'esique des surfaces riemanniennes \`a courbure $-1$},
     journal = {S\'eminaire de th\'eorie spectrale et g\'eom\'etrie},
     pages = {25--31},
     publisher = {Institut Fourier},
     address = {Grenoble},
     volume = {S9},
     year = {1991},
     language = {fr},
     url = {http://www.numdam.org/item/TSG_1991__S9__25_0/}
}