Skotnykov, V. V.     Energy spectrum of graphene with nitrogen impurity [Текст] / V.V. Skotnykov, S.P. Repetsky, I.G Vyshivanaya // Fifteenth International Young Scientists Conference "Optics & High Technology Material Science SPO 2014" : devoted to 180th anniversary of Taras Shevchenko Nat. Univ. of Kyiv & 75th anniversary of its Chair of Optics, Kyiv, Ukraine, Oct. 23-26, 2014 : / Taras Shevchenko Nat. Univ. of Kyiv (TSNUK) [etc.] ; [progr. comm.: O.K. Zakusylo (head) et al.]. — Kyiv : Київський університет, 2014. — P. 84.