Yong He Sixin Xu Kejun Zhu Ting Liu Yue Li A Genetic-Neural Method of Optimizing Cut-Off Grade and Grade of Crude Ore. 588-597 2008 ISNN (2) http://dx.doi.org/10.1007/978-3-540-87734-9_67 conf/isnn/2008-2 db/conf/isnn/isnn2008-2.html#HeXZLL08