1. Moroccan Association of Harmonic Analysis and Spectral Geometry 1 , Rabat, Morocco
2. Department of Mathematics, Faculty of Sciences, Hassan II University 2 , Casablanca, Morocco
3. Department of Mathematics, Faculty of Sciences and Technics (M’Ghila), Sultan Moulay Slimane University 3 , P.O. Box. 523, Béni Mellal, Morocco
4. Institut des Hautes Études Scientifiques Paris-Saclay University 4 , 35 route de Chartres, CS 40001 91893 Bures-sur-Yvette, France
5. Institut Henri Poincaré—UAR 839 Sorbonne University, CNRS 5 , 75231 Paris Cedex 05, France