1. Altshuller, A. P. and McBeam, G. A.: 1978, ?The LRTAP (Long-Range Transport of Air Pollutants) Problem in North America: A Preliminary Overview?, U.S. ? Canada Research Consultation Group on the Long-Range Transport of Air Pollutants Report, Research Triangle Park, NC.
2. Braunstein, H. M., Copenhaver, E. D., and Pfuderer, H. A.: 1977, ?Environmental, Health and Control Aspects of Coal Conversion an Overview?, Oak Ridge National Laboratory Report No. ORNL FIS-95, Vol. 2.
3. Brown, R. A. and Staines, P. K.: 1978,Marine Pollut. Bull. 9, 162.
4. Burke, J. C.: 1968,Limnol. Oceanogr. 13, 714.
5. Cogbill, C. V.: 1976,Water, Air, Soil Pollut. 6, 407.