@article{IM_1967__4_141896,
     author = {L.A. RUBEL and A.L. SHIELDS},
     title = {Hyperbolic {Mean} {Automorphic} {Functions.}},
     journal = {Inventiones mathematicae},
     pages = {294--298},
     publisher = {mathdoc},
     volume = {4},
     year = {1967},
     zbl = {0188.19103},
     url = {http://geodesic.mathdoc.fr/item/IM_1967__4_141896/}
}