@book{OptehostertJussen2023,
  author    = {Felix Optehostert and Philipp Jussen},
  title     = {KVD-Service-Studie 2017},
  editor    = {G{\"u}nther Schuh and Volker Stich and Gerhard Gudergan and Markus Schr{\"o}der},
  year      = {2023},
}