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Physics Letters A > 2009 > 373 > 37 > 3324-3329
Journal of Zhejiang University-SCIENCE A > 2006 > 7 > 3 > 361-367
Physics Letters A > 2009 > 373 > 37 > 3324-3329
Journal of Zhejiang University-SCIENCE A > 2006 > 7 > 3 > 361-367