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2. “DGNB – German Sustainable Building Council.” Deutsch, www.dgnb.de/en/.
3. GB Tools - Home Page, www.gbtoolsltd.com/.
4. Standard & Poor’s Financial Services LLC,Global Ratings Green Evaluation Report, 2017.
5. China Statistical Yearbook (2018). Available at: http://www.stats.gov.cn/tjsj/ndsj/2018/indexeh.htm.