@article{GDZPPN002198657,
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},
volume = {329},
year = {1981},
pages = {124-135},
zbl = {0464.22004},
url = {http://dml.mathdoc.fr/item/GDZPPN002198657}
}
Pytlik, T. Radial functions on free groups and a decomposition of the regular representation into irreducible components.. Journal für die reine und angewandte Mathematik, Tome 329 (1981) pp. 124-135. http://gdmltest.u-ga.fr/item/GDZPPN002198657/