@article{01625952,
title = {Period functions for Maass wave forms. I.},
journal = {Annals of Mathematics. Second Series},
volume = {153},
year = {2001},
pages = {191-258},
doi = {10.2307/2661374},
zbl = {1061.11021},
language = {en},
url = {http://dml.mathdoc.fr/item/01625952}
}
Lewis, J.; Zagier, D. Period functions for Maass wave forms. I.. Annals of Mathematics. Second Series, Tome 153 (2001) pp. 191-258. doi : 10.2307/2661374. http://gdmltest.u-ga.fr/item/01625952/