@techreport{daxbeck2009methodology,
  title = {Methodology for mapping of physical stocks}
  author = {Daxbeck, Hans and Buschmann, Heinz and Neumayer, Stefan and Brandt, Bernd},
  url = {Retrieved from: http://forwast.brgm.fr/Documents/Deliverables/Forwast_D23.pdf},
  year = {2009}
}