Cong Chunxiao, Yu Ting, Wang Haomin, Zheng Kaihong, Gao Pingqi, Chen Xiaodong, Zhang Qing
Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore.
Small. 2010 Dec 20;6(24):2837-41. doi: 10.1002/smll.201001184.