1. Soil processes and the behavior of metals;Alloway,1995
2. Studies on various potential growth stimulants for growing pigs with particular reference to their activity in supplementing that of copper sulphate;Barber;British Journal of Nutrition,1965
3. Bejing Statistical Yearbook;Beijing Municipal Bureau of Statistics,2007
4. Global trends in pig production; present and future;Best;The Pig Journal,2001
5. Heavy metals pollution in poultry and livestock feeds and manures under intensive farming in Jiangsu Province, China;Cang;Journal of Environmental Sciences,2004