Item from Mathematical Reviews (American Mathematical Society)--access
their stable url through the AMS database via an institutional library:
MR1985159 (2004c:91079) Grossman, Jerrold W. The evolution of the
mathematical research collaboration graph. Proceedings of the
Thirty-third Southeastern International Conference on Combinatorics,
Graph Theory and Computing (Boca Raton, FL, 2002). Congr. Numer. 158
(2002), 201--212. (Reviewer: Sandra L. Arlinghaus) 91D30 (01A80 05C80
05C90)