*Mark Ramm1, M. Arzig2, M. Bogdanov1, A. Denisov3, A. Kulik1, B. Mamin4, V. Neverov4, R. Sidorov4, D. Skvortsov4, B. Spill3, J. Steiner2, P. Wellmann2
(1. STR Group, Inc.(Russia), 2. Univ. Erlangen-Nürnberg(Germany), 3. PVA Crystal Growing Systems GmbH(Germany), 4. National Research Ogarev Mordovia State Univ.(Russia))