@article{martin2012materials,
  title = {Materials embodied in international trade - Global material extraction and consumption between 1995 and 2005}
  author = {Martin Bruckner and Stefan Giljum and Christian Lutz and Kirsten Svenja Wiebe},
  journal = {Global Environmental Change},
  doi = {10.1016/j.gloenvcha.2012.03.011},
  year = {2012}
}