@book{JanzEblingGottschalketal.2005,
  author    = {Norbert Janz and G{\"u}nther Ebling and Sandra Gottschalk and Hiltrud Niggemann},
  title     = {Services in the Fu­ture: Innovation Activities in the Service Sector. Survey 1999 (English translation) / Janz, N., G. Ebling, S. Gottschalk und H. Niggemann},
  year      = {2005},
}