@article {609413,
	title = {Effects of emission-sources reduction time and ratios on PM2.5 concentration over Beijing Municipality},
	journal = {China Environmental Science},
	volume = {35},
	number = {7},
	year = {2015},
	pages = {1921-1930},
	url = {http://www.cnki.com.cn/Article/CJFDTotal-ZGHJ201507001.htm},
	author = {Shixian Zhai and Xingqin An and Zhaobin Sun and Jun Liu}
}
