@article{wuana2011,
  title={Heavy Metals in Contaminated Soils: A Review of Sources, Chemistry, Risks and Best Available Strategies for Remediation},
  author={R. A. Wuana and F. E. Okieimen},
  year={2011},
  journal={ISRN Ecology},
  doi={10.5402/2011/402647},
  url={https://doi.org/10.5402/2011/402647}
}