@unpublished{Kohler2015,
  author    = {Kohler, Ulrich},
  title     = {Maintaining quality},
  series = {Survey research methods},
  volume    = {9},
  journal   = {Survey research methods},
  number    = {3},
  publisher = {European Survey Research Association},
  address   = {Duisburg},
  issn      = {1864-3361},
  pages     = {139 -- 140},
  year      = {2015},
  abstract  = {Survey Research Methods has slightly revised its publication policies. Firstly, starting with the publication of this Editorial, SRM will accept - under specified conditions - manuscripts that discuss experiments in non-probability samples for peer-review. Secondly, SRM will require authors to publish replication materials of their study as Online supplement to their article. Finally, Survey Research Methods will publish replication studies of articles published in the journal. This Editorial gives reasons for these changes.},
  language  = {en}
}