1. Cao Hongfa, Gao Yinxin, Shu Jianmin, Liu Yanyun, Su Yan, Liu Liangui, Chen Yanzhi, and Wang Wei: 1989, ?Study on the Relation between Decline of Fir Trees and Acid Precipitation at Mt. Emei?, in Proceedings of Acid Rain, pp. 409?420, Environmental Sciences Press (in Chinese).
2. Chen Chuyin, Fong Zhongwei, Cheng Borong, Zhang Jiawu, Zhou Chonglian, and Yang Jinkuan: 1989, ?Effects on Forest Ecosystem of Acid Rain in Southwestern China?, pp. 466?475 ibid. (in Chinese).
3. Cheng Borong, Xu Guangshan, Din Guifang, Zhang Yuhua, and Ning Yi: 1989, ?Effects of Acid Deposition on Soil and Forest Ecology in Chongqing?, pp. 428?434 ibid. (in Chinese).
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5. Cosby, B. J., Wright, R. F., Hornberger, G. M., and Galloway, J. N.: 1985b. Water Resour. Res. 21, 1591