@article{IM_1988__92_1_143580,
     author = {Jean Barge and Etienne Ghys},
     title = {Surfaces et cohomologie born\'ee.},
     journal = {Inventiones mathematicae},
     pages = {509--526},
     publisher = {mathdoc},
     volume = {92},
     number = {1},
     year = {1988},
     url = {http://geodesic.mathdoc.fr/item/IM_1988__92_1_143580/}
}