@book{Pooten2008,
  author    = {Pooten, Holger},
  title     = {W{\"a}hrungsunrechnung},
  volume    = {12},
  edition   = {Lektion 4},
  publisher = {Euroforum},
  address   = {D{\"u}sselforf},
  year      = {2008},
  language  = {mul}
}
@book{Pooten2008,
  author    = {Pooten, Holger},
  title     = {Latente Setuern},
  volume    = {12},
  edition   = {Lektion 10},
  publisher = {Euroforum},
  address   = {D{\"u}sseldorf},
  year      = {2008},
  language  = {mul}
}
@book{Pooten2008,
  author    = {Pooten, Holger},
  title     = {Auswertung von Kennzahlen und Risikomanagement, Euroforum 2008},
  edition   = {Lektion 2},
  publisher = {Euroforum},
  address   = {D{\"u}sseldorf},
  year      = {2008},
  language  = {de}
}