1. University IBN Zohr,Lab SIV,Department of Computer Science,Agadir,Morocco
2. University IBN Tofail,Lab Partial Differential Equations, Algebra and Spectral Geometry,Kenitra,Morocco
3. University IBN Zohr,Lab IRF-SIC,Department of Computer Science,Agadir,Morocco
4. Hassan First University,Lab of Mathematical Modeling and Economic Calculations,Settat,Morocco