Comparison of levels of four water-soluble ionic species in ambient PM2.5 in Beijing
XUE Lijie, SU Lingyan, WU Shaowei, GUO Xinbiao
Ecology and Environment . 2011, (9): 1315 -1319 .  DOI: 10.16258/j.cnki.1674-5906(2011)08-09-1315-05

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