@misc{indiciae8f59407a8788,
  title = {Linear-response theory revisited.},
  author = {DM Bylander and YM Gu and L Kleinman},
  year = {1995},
  doi = {10.1103/physrevb.51.2566},
  url = {https://pubmed.ncbi.nlm.nih.gov/9979013/},
  note = {Source identifier: 9979013}
}