@book{HufnagelBurgfeldSchaecher2008,
  author    = {Hufnagel, W. and Burgfeld-Sch{\"a}cher, B.},
  title     = {Investitions- und Finanzierungsmodelle, LE 1-4},
  address   = {Hagen},
  year      = {2008},
  language  = {de}
}