1. STRUCTURAL CHANGES INDUCED BY SIMULATED BODY FLUID ON SURFACE OF SINTERED TITANIUM-HYDROXYAPATITE IMPLANT MATERIALS. Authors: S. SIMON, D. MURESAN, C. POPA, I. BALASZ, VIORICA SIMON.2. STRUCTURAL STABILITY OF SOME PHOSPHATE GLASSES. Authors: S. SIMON, D. CACAINA, I. BALASZ.3. A KEY GENERATION ALGORITHM FOR VERNAM CYPHER. Authors: I. BALASZ.4. ENHANCED EXTRINSIC MAGNETORESISTANCE IN La0.8Pb0.2MnO3/Pb(Zr0.52Ti0.48)O3 CERAMIC COMPOSITES. Authors: I. BALASZ.