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1. Col de Porte conferences (Sapey) 1995,1996,1997,1998,1999, talks
2. LCMI Seminars (Grenoble) 1995,1996,1997,1998,1999, talks
3. 17th general Conference of the condensed matter division (Grenoble) 1998, Poster
4. Frühjahrstagungen der DPG (Regensburg, Münster)1996,1997,1999, 3 Poster, 1 presentation
5. Phonon 98 (Lancaster) 1998, Poster (presented by Dr. S. Knauth)
6. Microscopy on semiconducting materials (Oxford) 1999, Poster
7. Low Temperature 22 (Helsinki) 1999, Poster
8. Conference on Dynamical Processes in Excited States of Solids (Puerto Rica), 1999, Poster (presented by Prof. Dr. Grill, Leipzig)
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