@book{Maderdonner,
  author    = {Maderdonner, Otto},
  title     = {Nihongo e youkoso - Japanisch f{\"u}r Anf{\"a}nger},
  publisher      = {Fachhochschule Technikum Wien},
  subject      = {Language Learning},
  language  = {de}
}
@book{Maderdonner,
  author    = {Maderdonner, Otto},
  title     = {Nihongo e youkoso - L{\"o}sungsbuch mit CD},
  publisher      = {Fachhochschule Technikum Wien},
  subject      = {Language Learning},
  language  = {de}
}