1. Chen C. (1995) Map of China soil environmental background (in Chinese), China Environmental Science Publishing House, Beijing, China.
2. Cheng Z. (1989) The state and trend of acid precipitation monitoring in China, in Proceedings of the Expert Meeting on Acid Precipitation Network in East Asia, Toyama, Japan, October 26?28. 1993, pp 209?237.
3. Dovland H. (1989) in Proceedings of EMEP-the European monitonng and evaluation programme, ibid, 84?47.
4. Galloway J. N., Likens G. E., Xiong J. L. and Zhao D. W. (1987) Acid rain: A comparison of China, United States and a remote area. Science, vol 236, 1559?1562.
5. Han G. (1993) in Prediction of China environmental protection objectives (in Chinese), China Environmental Science Publishing House, Beijing, China.