@misc{felbacq2002direct,
  title={Direct evidence of negative refraction at media with negative ε and μ},
  author={Didier Felbacq},
  year={2002},
  eprint={cond-mat/0211333},
  archivePrefix={arXiv},
  primaryClass={cond-mat.mes-hall},
  url={https://arxiv.org/abs/cond-mat/0211333}
}