1. Nitrification in soil: An introductory history;Macdonald,1986
2. Nitrification and nitrogen removal;Sharma;Water Res.,1977
3. Biochemical ecology of nitrification and denitrification;Focht,1977
4. Nitrification in the treatment of sewage and wastewaters;Painter,1986
5. Microbial transformations of inorganic nitrogen;Painter;Prog. Water Tech.,1977