@article{haas2015how,
  title = {How Circular is the Global Economy? An Assessment of Material Flows, Waste Production, and Recycling in the European Union and the World in 2005}
  author = {Haas, Willi and Krausmann, Fridolin and Wiedenhofer, Dominik and Heinz, Markus},
  journal = {Journal of Industrial Ecology},
  url = {http://doi.wiley.com/10.1111/jiec.12244},
  year = {2015}
}