@article{IM_1980__57_142705,
     author = {Yuval Z. Flicker},
     title = {Automorphic {Forms} on {Covering} {Groups} of {GL(2).}},
     journal = {Inventiones mathematicae},
     pages = {119--182},
     publisher = {mathdoc},
     volume = {57},
     year = {1980},
     zbl = {0431.10014},
     url = {http://geodesic.mathdoc.fr/item/IM_1980__57_142705/}
}