Positron annihilation : Proceedings of the 9th International Conference on Positron Annihilation, August 26-31, 1991, Szombathely, Hungary. Pt.3 pp.1585-1588, 1992. Aederlmannsdorf, Switzerland. Trans Tech Publications
Positron annihilation : ICPA-10 : Proceedings of the 10th International Conference on Positron Annihilation, May 23-29, 1994, Beijing, China. Part2 pp.679-682, 1995. Aederlmannsdorf, Switzerland. Trans Tech Publications
Positron annihilation, ICPA-11 : Proceedings of the 11th International Conference on Positron Annihilation, Kansas City, Missouri, USA, May 1997. pp.466-468, 1997. Zuerich, Switzerland. Trans Tech Publications
Positron annihilation : Proceedings of the 9th International Conference on Positron Annihilation, August 26-31, 1991, Szombathely, Hungary. Pt.1 pp.655-658, 1992. Aederlmannsdorf, Switzerland. Trans Tech Publications