TY  - RPRT
TI  - Stratified partial likelihood estimation.
AU  - G Ridder
AU  - I Tunali
PY  - 1999
DO  - 10.1016/s0304-4076(98)00090-6
UR  - https://pubmed.ncbi.nlm.nih.gov/12322577/
ID  - 12322577
ER  -