Positron Annihilation for the Non-Destructive Assessment of the Early Stages of Damage M.T. Hutchings, D.J. Buttle, R. Colbrook, W. Dalzell et C.B. Scruby J. Phys. IV France, 05 C1 (1995) C1-111-C1-117 DOI: 10.1051/jp4:1995112