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\bibitem{Avetisyan_etal2012} {\textquotedblleft}\textit{Electric field tuning of the band gap in four layers of graphene with different stacking order}{\textquotedblright}. Avetisyan AA, Partoens B, Peeters FM, Proceedings of the Society of Photo-optical Instrumentation Engineers
T2 -- Conference on Photonics and Micro and Nano-structured Materials, JUN 28-30, 2011, Yerevan, ARMENIA , 84140 (2012).   http://doi.org/10.1117/12.923618

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