Positron annihilation : Proceedings of the 9th International Conference on Positron Annihilation, August 26-31, 1991, Szombathely, Hungary. Pt.2 pp.1185-1188, 1992. Aederlmannsdorf, Switzerland. Trans Tech Publications
Proceedings of the 16th International Conference on Defects in Semiconductors : Lehigh University, Bethlehem, Pennsylvania, 22-26 July 1991. Pt.1 pp.413-418, 1992. Zurich, Switzerland. Trans Tech Publications
Positron annihilation : Proceedings of the 9th International Conference on Positron Annihilation, August 26-31, 1991, Szombathely, Hungary. Pt.2 pp.1145-1148, 1992. Aederlmannsdorf, Switzerland. Trans Tech Publications
Positron annihilation : Proceedings of the 9th International Conference on Positron Annihilation, August 26-31, 1991, Szombathely, Hungary. Pt.1 pp.301-308, 1992. Aederlmannsdorf, Switzerland. Trans Tech Publications