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Hu, Biao; Li, Jian Yi . (2013). Dynamic Comparison Studies on Development of Low-Carbon City in Beijing-Tianjin-Hebei Region. Advanced Materials Research, 869-870(), 91–94. doi:10.4028/www.scientific.net/amr.869-870.91 
10.4028/www.scientific.net/amr.869-870.91