@article{moolenaar1999heavy-metal,
  title = {Heavy-Metal Balances, Part II: Management of Cadmium, Copper, Lead, and Zinc in European Agro-Ecosystems}
  author = {Moolenaar, Simon W.},
  journal = {Journal of Industrial Ecology},
  doi = {10.1162/108819899569386},
  year = {1999}
}