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Authors
Lozada-Hidalgo, M.
Zhang, S.
Hu, S.
Esfandiar, A.
Grigorieva, I. V.
Geim, A. K.
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Article History
Received: 15 December 2016
Accepted: 9 March 2017
First Online: 9 May 2017
Competing interests
: The authors declare no competing financial interests.
