Urgency Classification of Beijing Ecological Security Pattern Protection
YU Chaoyue, WANG Chenxu, FENG Zhe, WU Kening, ZHAO Huafu
Acta Scientiarum Naturalium Universitatis Pekinensis . 2020, (6): 1047 -1055 .  DOI: 10.13209/j.0479-8023.2020.093

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