TY  - RPRT
TI  - A simulation approach to determining sample size and power for group sequential trials.
AU  - Edward Lakatos
PY  - 2002
DO  - 10.1016/s0197-2456(01)00178-7
UR  - https://pubmed.ncbi.nlm.nih.gov/11943445/
ID  - 11943445
ER  -