@misc{indiciae7a977c1b3ac3,
  title = {Model selection techniques for the covariance matrix for incomplete longitudinal data.},
  author = {J J Grady and R W Helms},
  year = {1995},
  doi = {10.1002/sim.4780141302},
  url = {https://pubmed.ncbi.nlm.nih.gov/7481180/},
  note = {Source identifier: 7481180}
}