OXYGEN CONCENTRATION OF Eu1 Ba2 Cu3 O7-x IN VACUUM : AN ATOM PROBE STUDY II P.P. CAMUS, H.B. ELSWIJK et A.J. MELMED J. Phys. Colloques, 50 C8 (1989) C8-477-C8-480 DOI: 10.1051/jphyscol:1989881