1. Chemical Analysis of Ecological Materials;Allen,1974
2. Nickel, copper, zinc, and cadmium;Baker,1982
3. Revegetation of Metalliferous Mine Waste: The Range of Practical Techniques Used in Western Europe;Bradshaw,1992
4. Disturbed land reclamation in an arid environment;Day,1979
5. Heavy metal toxicity and iron chlorosis;DeKock;Annals of Botany,1956