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- Type of Document: Article
 - DOI: 10.1103/PhysRevLett.106.209702
 - Publisher: 2011
 - Keywords:
 - Source: Physical Review Letters ; Volume 106, Issue 20 , 2011 ; 00319007 (ISSN)
 - URL: http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.106.209702
 
		