LI Xiao-li , WANG Feng-xiang , ZHANG Lian-shui . Electromagnetically Induced Negative Refraction Driven by Microwave Field in Four-level System[J]. Journal of Hebei University(Natural Science Edition), 2011 , 31(6) : 596 -601 . DOI: 10.3969/j.issn.1000-1565.2011.06.008

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