The file astro-ph.gml contains the collaboration network of scientists
posting preprints on the astrophysics archive at www.arxiv.org, 1995-1999,
as compiled by M. Newman.  The network is weighted, with weights assigned
as described in the original papers.  Please cite, as appropriate, one or
more of:

  M. E. J. Newman, The structure of scientific collaboration networks,
  Proc. Natl. Acad. Sci. USA 98, 404-409 (2001).

  M. E. J. Newman, Scientific collaboration networks: I. Network
  construction and fundamental results, Phys. Rev. E 64, 016131 (2001).

  M. E. J. Newman, Scientific collaboration networks: II. Shortest paths,
  weighted networks, and centrality, Phys. Rev. E 64, 016132 (2001).