@article{AM2_1992__44_1_137484,
     author = {Zbigniew Gajda},
     title = {On functional equations associated with characters of unitary representations of groups.},
     journal = {Aequationes mathematicae},
     pages = {109--121},
     publisher = {mathdoc},
     volume = {44},
     number = {1},
     year = {1992},
     zbl = {0772.39007},
     url = {http://geodesic.mathdoc.fr/item/AM2_1992__44_1_137484/}
}