@article{SchoelerHerrmann1996,
  author    = {Sch{\"o}ler, Klaus and Herrmann, Hayo},
  title     = {Konjunkturindikatoren f{\"u}r ausgew{\"a}hlte Bundesl{\"a}nder Westdeutschlands},
  year      = {1996},
  language  = {de}
}
@article{SchoelerHerrmann1996,
  author    = {Sch{\"o}ler, Klaus and Herrmann, Hayo},
  title     = {Leading Indicators for West German Regions},
  isbn      = {1-85972-267-9},
  year      = {1996},
  language  = {en}
}