@misc{indiciae783afa707b2b,
  title = {Maximum likelihood analysis of generalized linear models with missing covariates.},
  author = {N J Horton and N M Laird},
  year = {1999},
  doi = {10.1177/096228029900800104},
  url = {https://pubmed.ncbi.nlm.nih.gov/10347859/},
  note = {Source identifier: 10347859}
}