@book{JanzEblingGottschalketal.2001,
  author    = {Janz, Norbert and Ebling, G{\"u}nther and Gottschalk, Sandra and Hempell, Thomas},
  title     = {Innovationsverhalten der deutschen Wirtschaft: Indikatorenbericht zur Innovationserhebung 2000 / Janz, N., G. Ebling, S. Gottschalk, T. Hempell, B. Peters, G. Ebling und H. Niggemann},
  publisher = {ZEW Zentrum f{\"u}r Europ{\"a}ische Wirtschaftsforschung},
  address   = {Mannheim},
  pages     = {12 S., graph. Darst},
  year      = {2001},
  language  = {de}
}
@book{JanzGottschalkHempelletal.2002,
  author    = {Janz, Norbert and Gottschalk, Sandra and Hempell, Thomas and Peters, Bettina},
  title     = {Innovation Activities in the German Economy. Report on Indicators from the Innovation Survey 2000 (English translation) / Janz, N., S. Gottschalk, T. Hempell, B. Peters, G. Ebling und H. Niggemann},
  publisher = {ZEW Zentrum f{\"u}r Europ{\"a}ische Wirtschaftsforschung},
  address   = {Mannheim},
  year      = {2002},
  language  = {en}
}