Guangming Lin Xin Lu Yongsheng Liang Lishan Kang Xin Yao A Self-adaptive Evolutionary Programming Based on Optimum Search Direction. 9-18 2008 ISICA http://dx.doi.org/10.1007/978-3-540-92137-0_2 conf/isica/2008 db/conf/isica/isica2008.html#LinLLKY08