@article{GDZPPN002207125,
title = {On traces of Hecke operators on the space of cusp froms of weight 1.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {394},
year = {1989},
pages = {166-180},
zbl = {0672.10022},
url = {http://dml.mathdoc.fr/item/GDZPPN002207125}
}
Hiramatsu, Toyokazu. On traces of Hecke operators on the space of cusp froms of weight 1.. Journal für die reine und angewandte Mathematik, Tome 394 (1989) pp. 166-180. http://gdmltest.u-ga.fr/item/GDZPPN002207125/