@misc{indiciae10dfeadb31ad,
  title = {Mathematical coupling: a simpler approach.},
  author = {Jon Rasbash and Harvey Goldstein},
  year = {2004},
  doi = {10.1093/ije/dyh304},
  url = {https://pubmed.ncbi.nlm.nih.gov/15358743/},
  note = {Source identifier: 15358743}
}