@article{GDZPPN002206447,
title = {Finite spanning sets for cusp forms and a related geometric result.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {394},
year = {1989},
pages = {186-195},
zbl = {0666.10016},
url = {http://dml.mathdoc.fr/item/GDZPPN002206447}
}
Katok, Svetlana. Finite spanning sets for cusp forms and a related geometric result.. Journal für die reine und angewandte Mathematik, Tome 394 (1989) pp. 186-195. http://gdmltest.u-ga.fr/item/GDZPPN002206447/