1. ACGIH (1980). Documentation of the Threshold Limit Values, 4th ed. American Conference of Governmental Industrial Hygienists, Cincinnati.
2. AMDUR, M. O. (1976). Toxicological guidelines for research on sulfur oxides and particulates. 4th Symposium on Statistics and the Environment, National Academy of Sciences, Washington, D.C.
3. Controlled exposures of human volunteers to sulfate aerosols;AVOL;American Review of Respiratory Diseases,1979
4. BOMBAUGH, K. J., LEE, K. W., OLDHAM, R. G. and KAPOR, S. (1981). Characterization of process liquids and organic condensates from the Lurgi coal gasification plant at Kosovo, Yugoslavia. EPA Symposium, Environmental Aspects of Fuel Conversion Technology, VI, Denver.
5. Health and Environmental Effects of Coal Gasification and Liquefaction Technologies;BROWN,1979