@article{chatzimpiros2012nitrogen,
  title = {Nitrogen food-print: N use and N cascade from livestock systems in relation to pork, beef and milk supply to Paris}
  author = {Chatzimpiros, P and Barles, S},
  journal = {Biogeosciences Discussions},
  doi = {10.5194/bgd-9-1971-2012},
  year = {2012}
}