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The 4 references without a DOI — listed, not checked
no DOI — not checkedDepartment of Energy Statistics of National Bureau of Statistics of China. China energy statistical yearbook of 2012. Beijing: China Statistical Press; 2013.
no DOI — not checkedMarkus A, Jiang KJ, Hao JM, Wang SX, Zhuang X, Wei W, Deng YX, Liu H, Xing J and Zhang CY, Imrich B, Jens B, Janusz C, Chris H, Lena H, Zbigniew K, Pallav P, Peter R, Wolfgang S, Geza T, Fabian W, Wilfried W. Gains asia: Scenarios for cost-effective control of air pollution and greenhouse gases in China. 2008.
no DOI — not checkedUSEPA's Office of Air and Radiation. The benefits and costs of the clean air act from 1990 to 2020. 2011.
no DOI — not checkedXu CQ, Hong JL, Ren YX, Wang QS, Yuan XL. Approaches for controlling air pollutants and their environmental impacts generated from coal-based electricity generation in China. Environ Sci Pollut Res. 2015;22(16):12399–410.
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