Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MS2_1975__37_166424, author = {Ralph Fr\"oberg}, title = {Determination of a class of {Poincar\'e} series.}, journal = {Mathematica Scandinavica}, pages = {29--39}, publisher = {mathdoc}, volume = {37}, year = {1975}, zbl = {0318.13027}, url = {http://geodesic.mathdoc.fr/item/MS2_1975__37_166424/} }
Ralph Fröberg. Determination of a class of Poincaré series.. Mathematica Scandinavica, Tome 37 (1975), pp. 29-39. http://geodesic.mathdoc.fr/item/MS2_1975__37_166424/