1. MATHEMATICAL MODELING FOR THE CRYSTALLIZATION PROCESS OF HYDROXYAPATITE OBTAINED BY PRECIPITATION IN AQUEOUS SOLUTION. Authors: VALENTINA R. DEJEU, BARABÁS RÉKA, POP ALEXANDRU, BOGYA ERZSÉBET SÁRA, PAUL ŞERBAN AGACHI.2. KINETIC STUDIES OF SORPTION OF COPPER(II) IONS ONTO DIFFERENT CALCIUM-HYDROXYAPATIE MATERIALS. Authors: VALENTINA ROXANA DEJEU, GRAZIELLA L. TURDEAN, ALEXANDRA CSAVDÁRI, BARABÁS RÉKA, IOAN BÂLDEA, BOGYA ERZSÉBET SÁRA.3. CONTINUOUS PRECIPITATION: A MODEL BASED STABILITY ANALYSIS. Authors: BARABÁS RÉKA.4. MULTI-METHOD ANALYSIS OF BRONZE AGE CERAMICS FROM SATU-MARE COUNTY, ROMANIA. Authors: BARABÁS RÉKA.