BibTex format
@article{Robertson:2016:10.1002/sim.6974,
author = {Robertson, DS and Prevost, AT and Bowden, J},
doi = {10.1002/sim.6974},
journal = {Statistics in Medicine},
pages = {3907--3922},
title = {Unbiased estimation in seamless phase II/III trials with unequal treatment effect variances and hypothesis-driven selection rules},
url = {http://dx.doi.org/10.1002/sim.6974},
volume = {35},
year = {2016}
}