@article{JRAM_1985__357_152711,
     author = {J.W. Cogdell},
     title = {Arithmetic cycles on {Picard} modular surfaces and modular forms of {Nebentypus.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {115--137},
     year = {1985},
     volume = {357},
     zbl = {0547.10028},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1985__357_152711/}
}