The characteristics of PM 2 . 5 in Beijing , China. He, K., Yang, F., Ma, Y., Zhang, Q., Yao, X., Chan, C., K., Cadle, S., Chan, T., & Mulawa, P. 35:4959-4970, 2001.
The characteristics of PM 2 . 5 in Beijing , China [pdf]Paper  bibtex   

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