Inter-Package Dependency Networks in Open-Source Software
  This research analyzes complex networks in open-source software at the inter-package level, where package dependencies often span across projects and between development groups. We review complex networks identified at ``lower'' levels of abstraction, and then formulate a description of interacting software components at the package level, a relatively ``high'' level of abstraction. By mining open-source software repositories from two sources, we empirically show that the coupling of modules at this granularity creates a small-world and scale-free network in both instances. 
Nathan LaBelle, Eugene Wallingford