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LI W, CHEN XL, WANG L, HE YH, WU ZF, CAI Y, ZHANG MW, WANG Y, HAN Y, LORTZ RW, ZHANG ZQ, SHENG P, WANG N

PHYSICAL REVIEW LETTERS

ZHANG HJ, LU JM, SHI W, WANG Z, ZHANG T, SUN MY, ZHENG Y, CHEN QH, WANG N, LIN JJ, SHENG P