First Author:   Gilbert Koenig BETA- University of Strasbourg koenig@unistra.fr   1 rue du banc strasbourg, 67100, FRANCE   +33388346692(Phone) +33388346692(Fax) http://www.beta-umr7522.fr/-KOENIG-Gilbert Second Author: Irem Zeyneloglu GIAM- Galatasaray University izeyneloglu@gsu.edu.tr   Istanbul, 34357, TURKEY   +902274480/590(Phone)