This is a very interesting Net Sci + Law Paper !
This is topic of great interest for a number of reasons. Mike, Jon and I have several papers in this basic direction (with hopefully more coming soon). Probably the most relevant of our paper is “Distance Measures for Dynamic Citation Networks” which we published in Physica A back in late-2010. For those who might be interested – a copy of our paper (with James H. Fowler) is available on SSRN and on ArXiv.