@misc{indiciae7d878e205072,
  title = {Air quality improvement estimation and assessment using contingent valuation method, a case study in Beijing.},
  author = {X J Wang and W Zhang and Y Li and K Z Yang and M Bai},
  year = {2006},
  doi = {10.1007/s10661-005-9054-z},
  url = {https://pubmed.ncbi.nlm.nih.gov/16770506/},
  note = {Source identifier: 16770506}
}