1. STUDY OF A MIXED PROBLEM FOR A NONLINEAR ELASTICITY SYSTEM BY TOPOLOGICAL DEGREE. Authors: MEROUANI BOUBAKEUR, ZOUBAI FAYROUZ.2. ON A PURE TRACTION PROBLEM FOR THE NONLINEAR ELASTICITY SYSTEM IN SOBOLEV SPACES WITH VARIABLE EXPONENTS. Authors: MEROUANI BOUBAKEUR, ZOUBAI FAYROUZ.