@misc{selbststandige,
  title   = {Self-employed persons},
  author  = {Blatter, Bettina and Lengwiler, Martin},
  year    = {2026},
  month   = {jun},
  url     = {https://www.historyofsocialsecurity.ch/articles/stakeholders/history-of-social-security-profiles-of-the-afflicted-groups/selbststandige}
}