Sample density method for unclassifiable region of support vector machine
LI Ren-bing, LI Ai-hua, ZHAO Jing-ru, WANG Xiao-wei, YANG Ying-tao
Journal of Systems Engineering and Electronics . 2010, (8): 1771 -1774 .  DOI: 10.3969/j.issn.1001-506X.2010.08.46