Huidong Jin Wing-Ho Shum Kwong-Sak Leung Man Leung Wong Expanding Self-Organizing Map for data visualization and cluster analysis. 157-173 2004 163 Inf. Sci. 1-3 http://dx.doi.org/10.1016/j.ins.2003.03.020 db/journals/isci/isci163.html#JinSLW04