@misc{indiciaec84a5c920341,
  title = {The structure within groups.},
  author = {J S Lindsay},
  year = {1967},
  doi = {10.1111/j.2044-8260.1967.tb00520.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/6077469/},
  note = {Source identifier: 6077469}
}