TY  - RPRT
TI  - REML and ML estimation for clustered grouped survival data.
AU  - K F Lam
AU  - David Ip
PY  - 2003
DO  - 10.1002/sim.1323
UR  - https://pubmed.ncbi.nlm.nih.gov/12802820/
ID  - 12802820
ER  -