@misc{Siekmann2018,
  author    = {Helmut Siekmann},
  title     = {Legal tender in the euro area},
  booktitle = {Working paper series / Institute for Monetary and Financial Stability ; 122},
  url       = {https://www.imfs-frankfurt.de/de/forschung/imfs-working-papers.html},
  institution = {Wirtschaftswissenschaften},
  series    = {Working paper series / Institute for Monetary and Financial Stability},
  number    = {122},
  type      = {workingpaper},
  pages     = {157},
  year        = {2018},
}