STRUCTURAL INVESTIGATIONS OF POLYCRISTALLINE YBCO THIN FILMS AND CERAMICS BY X-RAY AND STEM F. HOSSEINI TEHRANI, J. CHAZELAS, R. KORMANN, L. M. MERCANDALLI, R. CABANEL et G. GARRYJ. Phys. Colloques, 51 C1 (1990) C1-1061-C1-1066DOI: https://doi.org/10.1051/jphyscol:19901165