TY  - RPRT
TI  - Comparison of the spending function method and the Christmas tree correction for group sequential trials.
AU  - N Stallard
AU  - K M Facey
PY  - 1996
DO  - 10.1080/10543409608835149
UR  - https://pubmed.ncbi.nlm.nih.gov/8854238/
ID  - 8854238
ER  -