Institution: | Department of Physics, University of Jyv?skyl?, FIN-40351 Jyv?skyl?, Finland, FI NTT Basic Research Laboratories, 3-1, Morinosoto Wakamiya, Atsugi-shi, Kanagawa 243-01, Japan, JP University of Tokyo, Physics Department, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, JP
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