1) M. Sadakata, H. J. Kim, S. Hashimoto, K. Matui and X. Xu “Briquette combustion as countermeasure against acid rain damage in Chongqing”, Report of New Program for Promotion of Basic Sciences Studies of Global Environmental Charge with Special Reference to Asia and Pacific Regions, Vol.11-4 Ministry of Education, p.67-76 (1995)
2) International Symposium on the Air Control Policy and Strategy Chongqing' 92, Chongqing Envir. Protec. Bureau & A Group of Monbusho Inter. Sci. Res. Program of Japan, Chongqing China, 1992
3) G. Y. Chen, “Chongqing Environmental Science”, pp.2-5, vol.13, No.5, Oct. 1991, China
4) Personal Communication in “International Symposium on the Air Pollutoin Control Policy and Strategy Chongqing' 92”
5) Y. H. Zhuang, D. X. Shen and P. L. Xiao, “Processing and Utilization of High Sulfur Coals III”, edited by R. Markuszewski and T. D. Wheelock, p.653-662, Elsevier Sci. Pub., 1990