@article{Tietze2009,
  author    = {Tietze, J{\"u}rgen},
  title     = {Die Elastizit{\"a}t {\"o}konomischer Funktionen},
  series = {Das Wirtschaftsstudium : Wisu. 38 (2009), H. 8/9},
  journal   = {Das Wirtschaftsstudium : Wisu. 38 (2009), H. 8/9},
  publisher = {Lange},
  address   = {D{\"u}sseldorf},
  isbn      = {0340-3084},
  pages     = {1179 -- 1187},
  year      = {2009},
  language  = {de}
}