DEFECT CHARACTERIZATION OF Si+-IMPLANTED GaAs BY MONOENERGETIC POSITRON BEAM TECHNIQUE J.-L. LEE, K.-H. SHIM, S. TANIGAWA, A. UEDONO, J.S. KIM, H.M. PARK et D.S. MA J. Phys. Colloques, 49 C4 (1988) C4-457-C4-460 DOI: 10.1051/jphyscol:1988497