@misc{rdc-expansion-of-social-security-in-europe,
  title   = {{Expansion of Social Security in Europe}},
  author  = {},
  year    = {},
  month   = {},
  url     = {https://www.historyofsocialsecurity.ch/zeitstrahl/cww-expansion-and-consolidation-of-the-welfare-state/rdc-expansion-of-social-security-in-europe}
}