1. W.R. BLOOM, H. HEYER, Harmonic analysis of probability measures on hypergroups, De Gruyter Studies in Mathematics 20 (1995), De Gruyter; Berlin, New-York.
2. R.E. EDWARDS, Fourier Series, A modern Introduction Vol. II, Holt, Rinehart and Winston, Inc. (1967).
3. J.J.F. FOURNIER, K.A. ROSS, Random Fourier series on compact abelian hypergroups, J. Australian Math. Soc. 37 (1984), 45–81.
4. M.O. GEBUHRER, Changing signs in a Fourier series on a compact commutative hypergroup, in preparation.
5. M.O. GEBUHRER, Bounded measure algebras: a fixed point theorem approach. In “Applications of hypergroups and related measure algebras” (Providence, RI) (O. Gebuhrer, W.C. Con-nett, A.L. Schwartz, eds.) A.M.S., Contemporary Mathematics 183 (1995), 171–190.