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机译:
Institute of Physics, University of Tartu, Riia 142, Tartu 51014, Estonia;
Institute of Applied Physics, Military University of Technology, Kaliskiego 2, 00-908 Warsaw, Poland;
Electrical Engineering Department, Czestochowa University Technology, Armii Krajowej 17, Czestochowa, Poland;
crystal field parameter; electronic structure; optical absorption; YAB;