The research of spatial and temporal characteristics on air quality level in Pearl River Delta based on GIS
ZHANG Baochun, CHEN Yanjun, LI Weikeng, CHEN Huiming, LUO Jiahai
Ecology and Environmental Sciences . 2011, (4): 600 -605 .  DOI: 10.16258/j.cnki.1674-5906(2011)04-0600-06

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