@techreport{ViethHammerMaier2005,
  type      = {Working Paper},
  author    = {Vieth, Matthias and Hammer, A. and Maier, F.},
  title     = {A critical analysis of the co-plot method},
  series = {International University in Germany, School of Business Administration / Working paper},
  journal   = {International University in Germany, School of Business Administration / Working paper},
  number    = {32},
  publisher = {School of Business Administration, Intern. Univ. in Germany},
  address   = {Bruchsal},
  pages     = {22 Bl{\"a}tter},
  year      = {2005},
  language  = {en}
}
@techreport{BerneckerBoyerGathmann2018,
  type      = {Working Paper},
  author    = {Bernecker, Andreas and Boyer, Pierre and Gathmann, Christina},
  title     = {The Role of Electoral Incentives for Policy Innovation: Evidence from the US Welfare Reform},
  series = {CESifo Working Paper},
  journal   = {CESifo Working Paper},
  number    = {No. 6964},
  organization    = {CESifo Group Munich},
  issn      = {ISSN 2364-1428 (electronic version)},
  pages     = {60},
  year      = {2018},
  language  = {en}
}