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@article{MAN_1992__293_4_164956, author = {J.W. Cannon and Ph. Wagreich}, title = {Growth functions of surface groups.}, journal = {Mathematische Annalen}, pages = {239--258}, publisher = {mathdoc}, volume = {293}, number = {4}, year = {1992}, zbl = {0734.57001}, url = {http://geodesic.mathdoc.fr/item/MAN_1992__293_4_164956/} }
J.W. Cannon; Ph. Wagreich. Growth functions of surface groups.. Mathematische Annalen, Tome 293 (1992) no. 4, pp. 239-258. http://geodesic.mathdoc.fr/item/MAN_1992__293_4_164956/