@book{Tietze2008,
  author    = {Tietze, J{\"u}rgen},
  title     = {{\"U}bungsbuch zur Finanzmathematik. 5., aktualisierte Aufl.},
  publisher = {Vieweg},
  address   = {Wiesbaden},
  isbn      = {978-3-8348-0442-6},
  pages     = {XII, 410 S. : graph. Darst.},
  year      = {2008},
  language  = {de}
}
@book{Tietze2005,
  author    = {Tietze, J{\"u}rgen},
  title     = {{\"U}bungsbuch zur Finanzmathematik. Aufgaben, Testklausuren und L{\"o}sungen. 4., verb. u. erw. Aufl.},
  publisher = {Vieweg},
  address   = {Wiesbaden},
  isbn      = {3-8348-0030-9},
  pages     = {XII, 410 S. : graph. Darst.},
  year      = {2005},
  language  = {de}
}
@book{GrundmannSchoenholtz1999,
  author    = {Grundmann, Reinhard and Sch{\"o}nholtz, Friedrich},
  title     = {„Ventilatoren-Fibel" der Firma Babcock-BSH},
  publisher = {Promotor-Verlag},
  address   = {Karlsruhe},
  year      = {1999},
  language  = {de}
}