@article{FORUM_1993__5_3_141712,
     author = {Michael Harris},
     title = {Non-vanishing of {L-functions} of 2 x 2 unitary groups.},
     journal = {Forum mathematicum},
     pages = {405--420},
     publisher = {mathdoc},
     volume = {5},
     number = {3},
     year = {1993},
     zbl = {0779.11024},
     url = {http://geodesic.mathdoc.fr/item/FORUM_1993__5_3_141712/}
}