@article{Helfer2017ProsperityEnhancing,
  author = {Helena Helfer},
  title = {Prosperity-Enhancing Institutions: Towards a Comprehensive Composite Index},
  journal = {Social Indicators Research},
  year = {2017},
  volume = {134},
  number = {3},
  pages = {805--845},
  doi = {10.1007/s11205-016-1466-3},
  note = {Publication status: Published}
}

@article{Helfer2016SocialMarket,
  author = {Helena Helfer},
  title = {Social Market Economy --- A Contemporary Institutional
Framework},
  journal = {The WSB University Poznan Research Journal},
  year = {2016},
  volume = {68},
  number = {3},
  pages = {81--100},
  url = {https://www.wydawnictwo.wsb.pl/sites/wydawnictwo.wsb.pl/files/czasopisma-tresc/zn_poz_68_druk.pdf},
  note = {Publication status: Published}
}