@misc{indiciae29a0e8e6b6bd,
  title = {Multi-level repeated measures growth modelling using extended spline functions.},
  author = {H Pan and H Goldstein},
  year = {1998},
  doi = {10.1002/(sici)1097-0258(19981215)17:23<2755::aid-sim41>3.0.co;2-e},
  url = {https://pubmed.ncbi.nlm.nih.gov/9881421/},
  note = {Source identifier: 9881421}
}