@article{laird1982-7168798,
  author  = {Laird, Nan M. and Ware, James H.},
  title   = {{Random-Effects Models for Longitudinal Data}},
  journal = {Biometrics},
  year    = {1982},
  doi     = {10.2307/2529876},
  pmid    = {7168798},
  url     = {https://doi.org/10.2307/2529876}
}