@article{1077295387, author = {Xue, Xiaoxi}, title = {On the first Betti numbers of hyperbolic surfaces}, journal = {Duke Math. J.}, volume = {64}, number = {1}, year = {1991}, pages = { 85-110}, language = {en}, url = {http://dml.mathdoc.fr/item/1077295387} }
Xue, Xiaoxi. On the first Betti numbers of hyperbolic surfaces. Duke Math. J., Tome 64 (1991) no. 1, pp. 85-110. http://gdmltest.u-ga.fr/item/1077295387/