@misc{indiciaecf8b22ee51b8,
  title = {Using the longitudinal Guttman simplex as a basis for measuring growth.},
  author = {L M Collins and N Cliff},
  year = {1990},
  doi = {10.1037/0033-2909.108.1.128},
  url = {https://pubmed.ncbi.nlm.nih.gov/2200071/},
  note = {Source identifier: 2200071}
}