“…Cluster analysis, multidimensional analysis, and other techniques have been used in the visualization of retrieval results and of citation data (e.g., Chen & Kuljis, 2003;Chen et al, 2010;Ding et al, 2000;McKechnie, Goodall, LajoiePaquette, & Julien, 2005;Tang, 2004;White & Griffith, 1981;White & McCain, 1998). Since the early 1970s, researchers have used cluster analysis to study prominent researchers and publications, trends and evolution of specific science and engineering fields, and trends in the growth of scientific and publishing activities (e.g., Sharabchiev, 1989).…”