@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/