TY - JOUR AU - Ramamoorthy Ramesh AU - S Jin AU - P Marsh BT - Nature DO - 10.1038/346420a0 LA - eng M1 - 6283 N1 - cited By 15 PY - 1990 EP - 420 T2 - Nature TI - Superconductor defect structure [10] VL - 346 SN - 00280836 ER -