Azizi, Amin
Zou, Xiaolong
Ercius, Peter
Zhang, Zhuhua
Elías, Ana Laura
Perea-López, Néstor
Stone, Greg
Terrones, Mauricio
Yakobson, Boris I.
Alem, Nasim
Article History
Received: 12 April 2014
Accepted: 31 July 2014
First Online: 9 September 2014
Competing interests
: The authors declare no competing financial interests.