Proceedings of the 15th International Conference on Defects in Semiconductors : Budapest, Hungary, August 22-26, 1988. Part3 pp.1085-1090, 1989. Aederlmannsdorf, Switzwelns. Trans Tech Publications
Proceedings of the 17th International Conference on Defects in Semiconductors : ICDS-17, Gmunden, Austria, July 18-23, 1993. Pt.1 pp.653-656, 1994. Zurich, Switzerland. Trans Tech Publications