1. FEMTO-ST Institute, CNRS - LaRRIS, University Bourgogne Franche-Comté - Lebanese University,Faculty of Sciences,Montbéliard,France
2. University of Nebraska at Kearney,Kearney,USA
3. LaRRIS, Lebanese University,Faculty of Sciences,Fanar,Lebanon
4. FEMTO-ST Institute, CNRS, University Bourgogne Franche-Comté,Montbéliard,France