@article{MZ_1985__190_173615,
     author = {C. Epstein and J.L., Sarnak, P. Hafner},
     title = {Zeros of {L-Functions} {Attached} to {Maass} {Forms.}},
     journal = {Mathematische Zeitschrift},
     pages = {113--128},
     year = {1985},
     volume = {190},
     zbl = {0565.10026},
     url = {http://geodesic.mathdoc.fr/item/MZ_1985__190_173615/}
}