@misc{indiciae08d7758ea2ba,
  title = {Quantized density response in insulators.},
  author = {Q Niu},
  year = {1994},
  doi = {10.1103/physrevb.49.13554},
  url = {https://pubmed.ncbi.nlm.nih.gov/10010291/},
  note = {Source identifier: 10010291}
}