TY  - RPRT
TI  - Repeated confidence intervals for group sequential clinical trials.
AU  - C Jennison
AU  - B W Turnbull
PY  - 1984
DO  - 10.1016/0197-2456(84)90148-x
UR  - https://pubmed.ncbi.nlm.nih.gov/6713906/
ID  - 6713906
ER  -