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28) "Magnetic field effekt on tunnel ionization of deep impurities by terahertz radiation", S.D. Ganichev, S.N. Danilov, M. Sollinger, J. Zimmermann, A.S. Moskalenko, V.I. Perel, I.N. Yassievich, C. Back, W. Prettl, Int. Conf. IR&MM-Waves, Otsu (Japan) (2003), Conf. Digest, ed. N. Hiromoto, W5-1