المصدر: Haramounic analysis of probabilty measures on hypergroups and Harmonic analysis of probability mea في منتدى : قسم الرياضيات I need this books Generalized wavelets and hypergroups by Khalifa Trimèche and Harmonic analysis of probability measures on hypergroups by Walter R. Bloom,Herbert Heyer Deux cours d'analyse harmonique École d'été d'analyse harmonique de Tunis, 1984 ,