@article{JanzLoeoefPeters2004,
  author    = {Janz, Norbert and L{\"o}{\"o}f, Hans and Peters, Bettina},
  title     = {Firm Level Innovation and Productivity, Is there a Common Story Across Countries?},
  series = {Problems and Perspectives in Management (2004)},
  journal   = {Problems and Perspectives in Management (2004)},
  isbn      = {ISSN 1727-7051},
  pages     = {184 -- 204},
  year      = {2004},
  language  = {en}
}
@article{JanzGottschalk2004,
  author    = {Janz, Norbert and Gottschalk, Sandra},
  title     = {Innovationst{\"a}tigkeit deutscher Unternehmen. Messung, Bestimmungs- und Erfolgsfaktoren / Janz, N. und S. Gottschalk},
  series = {Economia (2004)},
  journal   = {Economia (2004)},
  pages     = {19 -- 29},
  year      = {2004},
  language  = {de}
}