Sin Chun Ng Shu Hung Leung Andrew Luk Yunfeng Wu Convergence Analysis of Generalized Back-propagation Algorithm with Modified Gradient Function. 3672-3678 2006 IJCNN http://dx.doi.org/10.1109/IJCNN.2006.247381 conf/ijcnn/2006 db/conf/ijcnn/ijcnn2006.html#NgLLW06