@article{GDZPPN002321394,
title = {Maass Operators and Eisenstein Series.},
journal = {Mathematische Annalen},
volume = {255},
year = {1981},
pages = {135-144},
zbl = {0455.10018},
url = {http://dml.mathdoc.fr/item/GDZPPN002321394}
}
Harris, Michael. Maass Operators and Eisenstein Series.. Mathematische Annalen, Tome 255 (1981) pp. 135-144. http://gdmltest.u-ga.fr/item/GDZPPN002321394/