@article{MZ_1975__141_172156,
     author = {Patrick X. Gallagher},
     title = {Functional {Equation} for {Spherical} {Functions} on {Finite} {Groups.}},
     journal = {Mathematische Zeitschrift},
     pages = {77--82},
     year = {1975},
     volume = {141},
     zbl = {0317.43015},
     url = {http://geodesic.mathdoc.fr/item/MZ_1975__141_172156/}
}