Shallow Impurities in Semiconductors : Proceedings of the Fifth International Conference on Shallow Impurities in Semiconductors "Physics and Control of Impurities", International Conference Center Kobe, Japan, 5 to 8 August, 1992. pp.225-230, 1993. Aedermannsdorf, Switzerland. Trans Tech Publications
Positron annihilation : Proceedings of the 9th International Conference on Positron Annihilation, August 26-31, 1991, Szombathely, Hungary. Pt.2 pp.1301-1304, 1992. Aederlmannsdorf, Switzerland. Trans Tech Publications
Proceedings of the 17th International Conference on Defects in Semiconductors : ICDS-17, Gmunden, Austria, July 18-23, 1993. Pt.3 pp.1583-1588, 1994. Zurich, Switzerland. Trans Tech Publications
Positron annihilation : ICPA-10 : Proceedings of the 10th International Conference on Positron Annihilation, May 23-29, 1994, Beijing, China. Part1 pp.553-556, 1995. Aederlmannsdorf, Switzerland. Trans Tech Publications