TY  - RPRT
TI  - Flexible implementations of group sequential stopping rules using constrained boundaries.
AU  - Bart E Burington
AU  - Scott S Emerson
PY  - 2003
DO  - 10.1111/j.0006-341x.2003.00090.x
UR  - https://pubmed.ncbi.nlm.nih.gov/14969454/
ID  - 14969454
ER  -