BibTex format
@unpublished{Galiffi:2019,
author = {Galiffi, E and Huidobro, PA and Pendry, JB},
publisher = {arXiv},
title = {Broadband nonreciprocal THz amplification in luminal graphene metasurfaces},
url = {http://arxiv.org/abs/1907.08421v1},
year = {2019}
}