@article{haberl2001the,
  title = {The Energetic Metabolism of Societies Part I: Accounting Concepts}
  author = {Haberl, Helmut},
  journal = {Journal of Industrial Ecology},
  url = {http://doi.wiley.com/10.1162/108819801753358481},
  doi = {10.1162/108819801753358481},
  year = {2001}
}