TY  - RPRT
TI  - SEQPWR and SEQOPR: computer programs for design of maximum information trials based on group sequential logrank tests.
AU  - K Kim
PY  - 1995
DO  - 10.1016/0169-2607(94)01615-m
UR  - https://pubmed.ncbi.nlm.nih.gov/7796583/
ID  - 7796583
ER  -