TY  - RPRT
TI  - Variance estimation in clinical studies with interim sample size re-estimation.
AU  - Frank Miller
PY  - 2005
DO  - 10.1111/j.1541-0420.2005.00315.x
UR  - https://pubmed.ncbi.nlm.nih.gov/16011681/
ID  - 16011681
ER  -