Author Affiliations +
Heinz-Wilhelm Hubers,1 Alexei Semenov,1 Heiko Richter,1 Martin Schwarz,1 Burghardt Gunther,1 Konstantin Smirnov,2 Gregory Gol'tsman,2 Boris Voronov2
1Moscow State Pedagogical Univ. (Germany)
2Moscow State Pedagogical Univ. (Russia)