TY  - RPRT
TI  - Sample size determination for group sequential clinical trials with immediate response.
AU  - K Kim
AU  - D L Demets
PY  - 1992
DO  - 10.1002/sim.4780111012
UR  - https://pubmed.ncbi.nlm.nih.gov/1518999/
ID  - 1518999
ER  -