@article{marc2016metal,
  title = {Metal accumulation in the Klip River wetland: Attenuation of pollution arising from acid mine drainage by a natural wetland on the Witwatersrand}
  author = {Marc S. Humphries
Terrence S. McCarthy
Letitia Pillay},
  journal = {South African Journal of Science},
  url = {https://www.sajs.co.za/article/view/3589},
  doi = {20160237},
  year = {2016}
}