@misc{indiciae8b0c27277087,
  title = {Some problems with negative refraction.},
  author = {J M Williams},
  year = {2001},
  doi = {10.1103/physrevlett.87.249703},
  url = {https://pubmed.ncbi.nlm.nih.gov/11736549/},
  note = {Source identifier: 11736549}
}