1. COORDINATION OF URANIUM(IV) IONS TO MONOLACUNAR AND TRILACUNAR KEGGIN-TYPE HETEROPOLYOXOMETALATES. SPECTROSCOPIC AND MAGNETIC INVESTIGATION. Authors: L. DAVID, O. COZAR, D. RUSU.2. SPECTROSCOPIC AND MAGNETIC INVESTIGATION OF TETRANUCLEAR MN(II) CLUSTER ENCAPSULATED IN SANDWICH-TYPE HETEROPOLYANION. Authors: M. HOSSU, D. RUSU, M. RUSU, L. DAVID, A. MARCU.3. SPECTROSCOPIC STUDIES OF LACUNARY POLYOXOTUNGSTATES CERIUM (III) COMPLEXES BASED ON α-Β-[ΒiIII W9O33]9- UNITS. Authors: L. DAVID, OANA BABAN, D. RUSU.