Distribution characteristics of negative air ions in forest region of Gansu
WANG Shunli, LIU Xiande, JIN Ming, CHE Zongxi, ZHAO Weijun, LIU Minglong
Ecology and Environmental Sciences . 2010, (7): 1563 -1568 .  DOI: 10.16258/j.cnki.1674-5906(2010)07-1563-06

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