@book{BirleBraigEtteetal.2006,
  author    = {Peter Birle and Marianne Braig and Ottmar Ette and Dieter Ingenschay},
  title     = {Hemisph{\"a}rische Konstruktionen der Amerikas},
  volume    = {109},
  isbn      = {3-86527-283-5},
  year      = {2006},
}