@book{Lehner,
  author    = {Lehner, Martin},
  title     = {Viel Stoff - wenig Zeit},
  publisher = {Haupt},
  address   = {Bern, Stuttgart, Wien},
  publisher      = {Fachhochschule Technikum Wien},
  subject      = {Vollst{\"a}ndigkeitsfalle},
  language  = {de}
}
@book{Lehner,
  author    = {Lehner, Martin},
  title     = {Viel Stoff - wenig Zeit, Wege aus der Vollst{\"a}ndigkeitsfalle},
  publisher = {Haupt},
  address   = {Bern, Stuttgart, Wien},
  publisher      = {Fachhochschule Technikum Wien},
  subject      = {Zeit},
  language  = {de}
}