Bloemen, R., A. Chintan, S. Kuhlmann, G. Ordóñez-Matamoros. (2014) “Innovation Diffusion in Open Source Software: Preliminary Analysis of Dependency Changes in the Gentoo Portage Package Database.” MSR 2014 Proceedings of the 11th Working Conference on Mining Software Repositories. Hyderabad, India. May 31 – June 1st. Pages 316-319. ISBN: 978-1-4503-2863-0. DOI: 10.1145/2597073.2597079 http://dl.acm.org/citation.cfm?id=2597079