@article{anke2015trading,
  title = {Trading Land: A Review of Approaches to Accounting for Upstream Land Requirements of Traded Products.}
  author = {Anke Schaffartzik, Helmut Haberl, Thomas Kastner, Dominik Wiedenhofer, Nina Eisenmenger, Karl-Heinz Erb},
  journal = {Journal of Industrial Ecology},
  doi = {10.1111/jiec.12258},
  year = {2015}
}