ACS Nano (2013) - Comment
pubmed: 23767402  doi: 10.1021/nn401183s  issn: 1936-086x  issn: 1936-0851 

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Soo-Ryoon Ryoo, Jung Hyun Lee, Jinah Yeo, Hee-Kyung Na, Young-Kwan Kim, Hongje Jang, Jung Hyun Lee, Sang Woo Han, Younghoon Lee, Vic Narry Kim, Dal-Hee Min