Authors
Henda El Amri
ISG, University of Sousse, Tunisia
Taher Hamza
IHEC, University of Carthage, Tunisia
© 2017 Henda El Amri, Taher Hamza, published by Lucian Blaga University of Sibiu
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.