BibTex format
@article{Stumpf:2007:10.1016/j.tree.2007.04.004,
author = {Stumpf, MPH and Kelly, WP and Thorne, T and Wiuf, C},
doi = {10.1016/j.tree.2007.04.004},
journal = {TRENDS IN ECOLOGY & EVOLUTION},
pages = {366--373},
title = {Evolution at the system level: the natural history of protein interaction networks},
url = {http://dx.doi.org/10.1016/j.tree.2007.04.004},
volume = {22},
year = {2007}
}