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  1. Sine and cosine type functional equations on hypergroups

    Article • Advances in Pure and Applied Mathematics, April 2019, De Gruyter

    Fouad Lehlou, mr roukbi ahmed

  2. On the superstability of the cosine and sine type functional equations

    Article • Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, January 2016, De Gruyter

    mr roukbi ahmed, Samir KABBAJ, Fouad Lehlou