TY  - RPRT
TI  - Estimating average regression effect under non-proportional hazards.
AU  - R Xu
AU  - J O'Quigley
PY  - 2000
DO  - 10.1093/biostatistics/1.4.423
UR  - https://pubmed.ncbi.nlm.nih.gov/12933565/
ID  - 12933565
ER  -