BibTex format
@article{Purvis:1997:10.1007/PL00006117,
author = {Purvis, A and Bromham, L},
doi = {10.1007/PL00006117},
journal = {JOURNAL OF MOLECULAR EVOLUTION},
pages = {112--119},
title = {Estimating the transition/transversion ratio from independent pairwise comparisons with an assumed phylogeny},
url = {http://dx.doi.org/10.1007/PL00006117},
volume = {44},
year = {1997}
}