@book{JanzLichtEblingetal.2005,
  author    = {Norbert Janz and Georg Licht and G{\"u}nther Ebling and Hiltrud Niggemann},
  title     = {Innovation in the Service Sector. Selected Facts and Some Policy Conclusions / Licht, G., G. Ebling, N. Janz, H. Niggemann},
  year      = {2005},
}