First Author:   Claudiu T Albulescu “Politehnica” University of Timişoara claudiu.albulescu@ct.upt.ro   P-ta. Victoriei, No. 2 Timisoara, 300006, Romania   +40 743 089 759(Phone) +40 743 089 759(Fax) http://www.upt.ro/ Second Author: Daniel Goyeau University of Poitiers daniel.goyeau@univ-poitiers.fr   Poitiers, 86022, France       http://sceco.univ-poitiers.fr/ Third Author: Dominique Pépin University of Poitiers dominique.pepin@univ-poitiers.fr   93 Avenue du Recteur Pineau Poitiers, 86022, France       http://sceco.univ-poitiers.fr/