1. Nitrogen in Industry;Farrell,1971
2. The nitrogen cycle;Delwiche;Sci. Am.,1970
3. Chemical Methods for Nitrification Control;Young,1975
4. Design of cross flow cooling towers and ammonia stripping towers;Wnek;Ind. Eng. Chem., Process Des. Dev.,1972
5. Ion exchanger treatment of waste water from the nitrogen fertilizer industry;Arion,1973