Oxygen in GaAs and its relation to the EL3 defect investigated by TSC and PICTS A. Wohlrab, B. Gründig-Wendrock, M. Jurisch, F.-M. Kiessling and J. R. Niklas Eur. Phys. J. Appl. Phys., 27 1-3 (2004) 223-226 Published online: 15 July 2004 DOI: 10.1051/epjap:2004148