In the paper Van Eck, N.J., Waltman, L., Dekker, R., & Van den Berg, J. (2010). A comparison of two techniques for bibliometric mapping: Multidimensional scaling and VOS. Journal of the American Society for Information Science and Technology, 61(12), 2405-2416 three co-occurrence networks were made available: authors, journals and keywords.
The networks were transformed into Pajek format by Vladimir Batagelj on January 28, 2011.