@ARTICLE {29683,
author={E.  Galiffi and P. Huidobro and J. B. P.  Pendry},
doi={10.1103/PhysRevLett.123.206101},
journal={Physical Review Letters},
title={Broadband Nonreciprocal Amplification in Luminal Metamaterials},
year={2019},
month={November},
volume={123},
number={20},
pages={206101 -206101-6},
ISSN={1079-7114}
}
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