Four-terminal impedance of a graphene nanoribbon based structureYi-Jian Shi, Jin Lan, En-Jia Ye, Wen-Quan Sui and Xuean ZhaoEur. Phys. J. B, 87 10 (2014) 251DOI: https://doi.org/10.1140/epjb/e2014-50321-0