TY  - RPRT
TI  - Fitting nonlinear and constrained generalized estimating equations with optimization software.
AU  - M Contreras
AU  - L M Ryan
PY  - 2000
DO  - 10.1111/j.0006-341x.2000.01268.x
UR  - https://pubmed.ncbi.nlm.nih.gov/11129490/
ID  - 11129490
ER  -