1. ANALYSIS OF A ELECTRO-ELASTIC CONTACT PROBLEM WITH FRICTION AND ADHESION. Authors: SALAH DRABLA, ZILOUKHA ZELLAGUI.2. VARIATIONAL ANALYSIS OF A ELASTIC-VISCOPLASTIC CONTACT PROBLEM WITH FRICTION AND ADHESION. Authors: SALAH DRABLA, ZHOR LERGUET.3. GENERAL STABILIZATION OF A THERMOELASTIC SYSTEMS WITH A BOUNDARY CONTROL OF A MEMORY TYPE. Authors: NESRINE SEMCHEDINE, HAMID BENSERIDI, SALAH DRABLA.4. GENERAL DECAY RATES OF THE SOLUTION ENERGY IN A VISCOELASTIC WAVE EQUATION WITH BOUNDARY FEEDBACK AND A NONLINEAR SOURCE. Authors: ISLEM BAAZIZ, BENYATTOU BENABDERRAHMANE, SALAH DRABLA.