@misc{indiciae6f3562689050,
  title = {On group sequential procedures under variance heterogeneity.},
  author = {A Hussein and K C Carriere},
  year = {2005},
  doi = {10.1191/0962280205sm0391oa},
  url = {https://pubmed.ncbi.nlm.nih.gov/15807147/},
  note = {Source identifier: 15807147}
}