@article{GDZPPN002338424, title = {Vanishing periods of cusp forms over modular symbols.}, journal = {Mathematische Annalen}, volume = {295}, year = {1993}, pages = {709-724}, zbl = {0786.11028}, url = {http://dml.mathdoc.fr/item/GDZPPN002338424} }
Ash, Avner; Ginzburg, David; Rallis, S. Vanishing periods of cusp forms over modular symbols.. Mathematische Annalen, Tome 295 (1993) pp. 709-724. http://gdmltest.u-ga.fr/item/GDZPPN002338424/