@article{TSG_1991-1992__10__97_0,
     author = {Castillon, Philippe},
     title = {M\'etriques \`a entropie topologique positive sur $S^2$},
     journal = {S\'eminaire de th\'eorie spectrale et g\'eom\'etrie},
     pages = {97--107},
     publisher = {Institut Fourier},
     address = {Grenoble},
     volume = {10},
     year = {1991-1992},
     mrnumber = {1715917},
     zbl = {0778.58035},
     language = {fr},
     url = {http://www.numdam.org/item/TSG_1991-1992__10__97_0/}
}