TY  - RPRT
TI  - Nonparametric tests for stratum effects in the Cox model.
AU  - J Sun
AU  - I Yang
PY  - 2000
DO  - 10.1023/a:1026501214397
UR  - https://pubmed.ncbi.nlm.nih.gov/11190602/
ID  - 11190602
ER  -