BibTex format
@article{Bryant:1997:10.1112/S0024610796004711,
author = {Bryant, RM and Evans, DM},
doi = {10.1112/S0024610796004711},
journal = {Journal of the London Mathematical Society},
pages = {363--369},
title = {The small index property for free groups and relatively free groups},
url = {http://dx.doi.org/10.1112/S0024610796004711},
volume = {55},
year = {1997}
}