@techreport{BehrendtScharpErdmannetal.2007,
  author    = {Behrendt, Siegfried and Scharp, Michael and Erdmann, Lorenz and Kahlenborn, Walter and Feil, Moira and Dereje, Cornelia and Bleischwitz, Raimund and Delzeit, Ruth},
  title     = {Rare metals : measures and concepts for the solution of the problem of conflict-aggravating raw material extraction ; the example of coltan},
  series = {Texte / Umweltbundesamt},
  volume    = {2007,23},
  institution = {Umweltbundesamt},
  address   = {Dessau},
  pages     = {64},
  year      = {2007},
  language  = {en}
}