@article{IM_1987__88_143441,
     author = {S.P. Plotnick and W.J. Floyd},
     title = {Growth functions on {Fuchsian} groups and the {Euler} characteristic.},
     journal = {Inventiones mathematicae},
     pages = {1--30},
     publisher = {mathdoc},
     volume = {88},
     year = {1987},
     zbl = {0608.20036},
     url = {http://geodesic.mathdoc.fr/item/IM_1987__88_143441/}
}