@misc{indiciaeac528b8dd944,
  title = {Fitting nonlinear and constrained generalized estimating equations with optimization software.},
  author = {M Contreras and L M Ryan},
  year = {2000},
  doi = {10.1111/j.0006-341x.2000.01268.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/11129490/},
  note = {Source identifier: 11129490}
}