“…It emphasizes the importance of information visualization techniques and readily available data such as the citation databases compiled by the Institute for Scientific Information (ISI). Recently, an increasing number of KDV studies began to emerge in a variety of knowledge domains, including information science (White & McCain, 1998), computer graphics (Chen, Paul, & O'Keefe, 2001), mass extinction (Chen, Cribbin, Macredie, & Morar, 2002), mad cow disease Chen, Kuljius, & Paul, 2001), and visual interfaces of digital libraries (Boyack, Wylie, & Dividson, 2002).…”