TY  - RPRT
TI  - Exact permutational tests for group sequential clinical trials.
AU  - C R Mehta
AU  - N Patel
AU  - P Senchaudhuri
AU  - A Tsiatis
PY  - 1994
UR  - https://pubmed.ncbi.nlm.nih.gov/7786986/
ID  - 7786986
ER  -