@misc{indiciae212596335d04,
  title = {A low-wave-vector expansion for reflectivity.},
  author = {BL Carvalho and SH Chen},
  year = {1993},
  doi = {10.1103/physreve.47.743},
  url = {https://pubmed.ncbi.nlm.nih.gov/9960057/},
  note = {Source identifier: 9960057}
}