Study of Defects in GaAs by 2D-ACAR Positron Annihilation A.A. Manuel, R. Ambigapathy, P. Hautojärvi, K. Saarinen et C. Corbel J. Phys. IV France, 05 C1 (1995) C1-73-C1-80 DOI: 10.1051/jp4:1995108