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V.V. Eremenko, V.A. Sirenko, I.A. Gospodarev, E.S. Syrkin, S.B. Feodosyev, I.S. Bondar, S.S. Saxena, A. Feher, and K.A. Minakova, Effect of step-edge on spectral properties and planar stability of metallic bigraphene: Пористые и низкоразмерные структуры, Low Temp. Phys. 42, (2015) [Fiz. Nizk. Temp. 42, 134-141, (2015)] DOI: https://doi.org/10.1063/1.4941004 .