@article{JRAM_1981__326_152373,
     author = {T. Pytlik},
     title = {Radial functions on free groups and a decomposition of the regular representation into irreducible components.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {124--135},
     publisher = {mathdoc},
     volume = {326},
     year = {1981},
     zbl = {0464.22004},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1981__326_152373/}
}