TY  - RPRT
TI  - A note on P-values under group sequential testing and nonproportional hazards.
AU  - Daniel L Gillen
AU  - Scott S Emerson
PY  - 2005
DO  - 10.1111/j.1541-0420.2005.040342.x
UR  - https://pubmed.ncbi.nlm.nih.gov/16011703/
ID  - 16011703
ER  -