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Yuriy G. Pogorelov, Denis Kochan, and Vadim M. Loktev, Electronic spectra, topological states and impurity effects in graphene nanoribbons, Low Temp. Phys. 47, 754–764, (2021) [Fiz. Nizk. Temp. 47, 819-829, (2021)] DOI: https://doi.org/10.1063/10.0005798.