1. SPECTROSCOPICAL CHARACTERISATION OF PRECURSORS FOR CALCIUM HYDROXIDE SYNTHESIS. Authors: CRINA DAN, ELISABETH-JEANNE POPOVICI, LAURA UNGUR, LIGIA PASCU, CRISTINA CIOCAN, R. GRECU.2. SPECTROSCOPICAL INVESTIGATION OF SOME CALIX[N]ARENES DERIVATIVES UTILISABLE AS METAL EXTRACTING AGENTS. Authors: CRISTINA CIOCAN, ELISABETH-JEANNE POPOVICI, CRINA DAN, MARIA VĂDAN, R. GRECU, N. POPOVICI.3. STUDIES ON SOME OZONE DECOMPOSITION CATALYSTS BASED ON NICKEL OXIDE. Authors: CRINA DAN, ELISABETH-JEANNE POPOVICI, FLORICA IMRE, EMIL INDREA, PETRE MĂRGINEAN, IOAN SILAGHI-DUMITRESCU.