COMBINED FIELD ION AND FIELD ELECTRON EMISSION MICROSCOPY AND ENERGY-RESOLVED ATOM-PROBE SPECTROSCOPY OF Y Ba2 Cu3 O7-x N. ERNST, G. BOZDECH and A.J. MELMED J. Phys. Colloques, 49 C6 (1988) C6-453-C6-458 DOI: 10.1051/jphyscol:1988677