@article{JRAM_1987__377_152932,
     author = {James Lee Hafner},
     title = {Zeros on the critical line for {Maass} wave form {L-functions.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {127--158},
     publisher = {mathdoc},
     volume = {377},
     year = {1987},
     zbl = {0603.10028},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1987__377_152932/}
}