1. Federation. ( 2005). The Swedish Forest Industries 2004—Facts and Figures, Stockholm: Media Express Förlag och Information AB.
2. Improvement. ( 1995). National Council of the Paper Industry for Air and Stream Improvement: Health Effects of Reduced Sulfur Gases, Technical bulletin # 691, Research Triangle Park, NC.
3. , & ( 1999). Biotechnology for Environmental Protection in the Pulp and Paper Industry, Berlin: Springer Verlag.
4. ( 1999). Biofiltration for the Removal of Reduced Sulfur Gases from Low Concentration Air Streams, Ph.D. thesis, University of British Columbia, Vancouver, BC.
5. ( 1999). Lange's Handbook of Chemistry, Knoxville, TN: McGraw Hill.