@article{thomas2014cropland,
  title = {Cropland area embodied in international trade: contradictory results from different approaches}
  author = {Thomas Kastner, Anke Schaffartzik, Nina Eisenmenger, Karl-Heinz Erb, Helmut Haberl, Fridolin Krausmann},
  journal = {Ecological Economics},
  doi = {10.1016/j.ecolecon.2013.12.003},
  year = {2014}
}