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D.O. Oriekhov, E.V. Gorbar, and V.P. Gusynin, Electronic states of pseudospin-1 fermions in dice lattice ribbon, Low Temp. Phys. 44, (2018) [Fiz. Nizk. Temp. 44, 1678-1691, (2018)] DOI: https://doi.org/10.1063/1.5078627.