1. HYDROXYAPATITE FOR REMOVAL OF HEAVY METALS FROM WASTEWATER. Authors: ALEXANDRA AVRAM, TIBERIU FRENTIU, OSSI HOROVITZ, AURORA MOCANU, FIRUŢA GOGA, MARIA TOMOAIA-COTIŞEL.2. IN MEMORIAM PROF. EMIL CORDOȘ PH.D. 1936 - 2021. Authors: TIBERIU FRENTIU.3. REGIONAL PATTERN AND CHARACTERISTICS OF ESSENTIAL ELEMENTS IN SEVERAL MEDICINAL PLANTS USING SPECTROMETRIC METHODS COMBINED WITH MULTIVARIATE STATISTICAL APPROACHES . Authors: SIMONA CODRUȚA AURORA COBZAC, TIBERIU FRENTIU, BILIJANA BALABANOVA, NATALJA MARKOVA RUZDIK, DORINA CASONI.