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Authors
Su, Y.
Kravets, V. G.
Wong, S. L.
Waters, J.
Geim, A. K.
Nair, R. R.
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Article History
Received: 24 April 2014
Accepted: 29 July 2014
First Online: 11 September 2014
Competing interests
: The authors declare no competing financial interests.
