Citation: A. Ritter et al., TANTALUM CLUSTER IN AN OXIDIC MATRIX - SYNTHESIS AND STRUCTURES OF MIXED-VALENCE OXOTANTALATES M2-DELTA-TA15O32 (M = K, RB (DELTA = 0) - M = SR (DELTA = 0.15), BA (DELTA = 0.12)), Zeitschrift fur anorganische und allgemeine Chemie, 624(11), 1998, pp. 1791-1795