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APA Citation
Tong, S., Bao, Y., Te, R., Ma, Q., Ha, S., & Lusi, A. (2017). analysis of Drought Characteristics in Xilingol Grassland of Northern China Based on SPEI and Its Impact on Vegetation. Mathematical problems in engineering, 2017, . http://access.bl.uk/ark:/81055/vdc_100160939926.0x000052