TY  - RPRT
TI  - Nested frailty models using maximum penalized likelihood estimation.
AU  - V Rondeau
AU  - L Filleul
AU  - P Joly
PY  - 2006
DO  - 10.1002/sim.2510
UR  - https://pubmed.ncbi.nlm.nih.gov/16463308/
ID  - 16463308
ER  -