Variation trends and affect factors of visibility in Tianjin
LIU Aaixia, HAN Suqin, CAI Ziying, ZHANG Min, LI Xiangjin
Ecology and Environment . 2012, (11): 1847 -1850 .  DOI: 10.16258/j.cnki.1674-5906(2012)11-1847-04

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