Chaofeng Sha Zhen Xu Xiaoling Wang Aoying Zhou Directly Identify Unexpected Instances in the Test Set by Entropy Maximization. 659-664 2009 APWeb/WAIM http://dx.doi.org/10.1007/978-3-642-00672-2_67 conf/waim/2009 db/conf/waim/waim2009.html#ShaXWZ09