@article {PMID:22125907,
	title = {Developing chemical signatures of particulate air pollution in the Pearl River Delta region, China},
	journal = {Journal of environmental sciences (China)},
	volume = {23},
	number = {7},
	year = {2011},
	pages = {1143{\textemdash}1149},
	issn = {1001-0742},
	url = {http://europepmc.org/abstract/MED/22125907},
	author = {Mei* Zheng and Yuan Cheng and Limin Zeng and Yuanhang* Zhang}
}
