  A theorem of Wiener on the circle group was strengthened and extended by
Fournier in [2] to locally compact abelian groups and extended further to the
Bessel-Kingman hypergroup with parameter {\alpha} = 1 / 2 by
Bloom/Fournier/Leinert in [1]. We further extend this theorem to Bessel-Kingman
hypergroups with parameter {\alpha} > 1 / 2 .
