@techreport{unep2016global,
  title = {Global Material Flows and Resource Productivity. An Assessment Study of the UNEP International Resource Panel.}
  author = {UNEP,  and Schandl, Heinz and Fischer-Kowalski, Marina and West, James and Giljum, Stefan and Dittrich, Monika and Eisenmenger, Nina and Geschke, Arne and Lieber, Mirko and Wieland, Hanspeter and Schaffartzik, Anke and Krausmann, Fridolin and Gierlinger, Sylvia and Hosking, Karin and Lenzen, Manfred and Tanikawa, Hiroki and Miatto, Alessio and Fishman, Tomer},
  url = {https://www.resourcepanel.org/file/423/download?token=Av9xJsGS},
  year = {2016}
}