@article{kovanda2009analysis,
  title = {Analysis of regional material flows: The case of the Czech Republic}
  author = {Kovanda, Jan and Weinzettel, Jan and Hak, Tomas},
  journal = {Resources, Conservation and Recycling},
  doi = {10.1016/j.resconrec.2008.12.004},
  year = {2009}
}