@article {609414,
	title = {Evaluation of PM2.5 decrease in Beijing after emission restrictions in the Beijing-Tianjin-Hebei and surrounding regions},
	journal = {China Environmental Science},
	volume = {34},
	number = {11},
	year = {2014},
	pages = {2726-2733},
	url = {http://en.cnki.com.cn/Article_en/CJFDTotal-ZGHJ201411002.htm},
	author = {Jun Liu and Xingqin An and Tong Zhu and Shixian Zhai and Li, Nan}
}
