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							Hazimu Kawamura
														
									Institute for Solid State Physics, University of Tokyo
							 
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							Masakazu Fukai
														
									Institute for Solid State Physics, University of Tokyo
							 
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							Kenji Sekido
														
									Institute for Solid State Physics, University of Tokyo
							 
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							Isamu Imai
														
									Institute for Solid State Physics, University of Tokyo