LOCAL CONFIGURATIONS IN ERBA2CU3O6+X FOR 0.15-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-0.9 - Varotto, M; Amoretti, G; Bucci, C; Derenzi, R; Guidi, G; Jang, S; Radaelli, P; Segre, C (1994)