@article{hoekstra2006constructing,
  title = {Constructing physical input–output tables for environmental modeling and accounting: Framework and illustrations}
  author = {Hoekstra, Rutger; van den Bergh, Jeroen C. J. M.},
  journal = {Ecological Economics},
  url = {http://www.sciencedirect.com/science/article/pii/S0921800905005136},
  doi = {10.1016/j.ecolecon.2005.11.005},
  year = {2006}
}