@article{JRAM_1996__478_153846,
     author = {Wojciech Chojnacki},
     title = {Group representations of bounded cosine functions.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {61--84},
     publisher = {mathdoc},
     volume = {478},
     year = {1996},
     zbl = {0855.43008},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1996__478_153846/}
}