TY  - RPRT
TI  - Group sequential designs for phase II trials with historical controls.
AU  - M N Chang
AU  - J J Shuster
AU  - J L Kepner
PY  - 1999
DO  - 10.1016/s0197-2456(99)00008-2
UR  - https://pubmed.ncbi.nlm.nih.gov/10440562/
ID  - 10440562
ER  -