1. Boyack, KW, Wylie, BN, Davidson, GS, and Johnson, DK (2000). Analysis of Patent Databases using Vxinsight (SAND2000-2266C). Albuquerque, NM: Sandia National Laboratories. http:// www.cs.sandia.gov/projects/VxInsight/pubs/npivm00.pdf
2. Braam, RR, Moed, HF, and Raan, AFJ van (1991a). Mapping of science by combined co-citation and word analysis. I: Structural aspects. Journal of the American Society for Information Science, 42(4),233–51.
3. Braam, RR, Moed, HF, and Raan, AFJ van (1991b). Mapping of science by combined co-citation and word analysis. II: Dynamical aspects. Journal of the American Society for Information Science,42(4), 252–66.
4. Bush, V (1945). As we may think. Atlantic Monthly, 176(1), 101–8.
5. Callon, M, Courtial, JP, Turner, WA, and Bauin, S (1983). From translations to problematic networks-an introduction to co-word analysis. Social Science Information Sur Les Sciences Sociales, 22(2),191–235.