Kim Dong Sik, Ji Ran, Fan Hong Jin, Bertram Frank, Scholz Roland, Dadgar Armin, Nielsch Kornelius, Krost Alois, Christen Jürgen, Gösele Ulrich, Zacharias Margit
Max Planck Institute of Microstructure Physics, Weinberg 2, 06120 Halle, Germany.
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