Paper: PNAS (2004) The simultaneous evolution of author and paper networks

by: Katy Börner, Jeegar T. Maru, and Robert L. Goldstone, PNAS April 6, 2004 vol. 101 no. Suppl 1 5266-5273 

Available at:    http://www.pnas.org/content/101/suppl.1/5266.full