3VAUGHAN L, WU G Z. Links to commercial Websites as a sourrces of business information [C] //Proceedings of Interna- tional Conference on Scientometrics and Informetrics, Beijing, China, 2004.
4VAUGHAN L Exploring Website features for business informa- tion [J]. Seientometrics, 2004, 61 (3): 467-477.
5THELWALL M. A comparison of sources of links for academic Web impact factor calculations [ J ]. Journal of Documenta- tion, 2002, 58 (1): 66-78.
6SMALL H. Co- citation in the scientific literature: a new meas- ure of the relationship between two socuments. [ J]. Journal of the American Society for Information Science, 1973, 24 (4) : 269 -272.
