@article{MAN_1983__264_163767,
     author = {James Lee Hafner},
     title = {Explicit {Estimates} in the {Arithmetic} {Theory} of {Cusp} {Forms} and {Poincar\'e} {Series.}},
     journal = {Mathematische Annalen},
     pages = {9--20},
     publisher = {mathdoc},
     volume = {264},
     year = {1983},
     zbl = {0497.10017},
     url = {http://geodesic.mathdoc.fr/item/MAN_1983__264_163767/}
}