(1)
Yu.V. Skrypnyk and V.M. Loktev, Spectral function of graphene with short-range impurity centers: Graphene and graphite multilayers, Low Temp. Phys. 34, (2008) [Fiz. Nizk. Temp. 34, 1040-1048, (2008)] DOI: https://doi.org/10.1063/1.2981395.