Xiaowei Zhao 0003 Haoxiang Xia Hong Yu 0005 Linlin Tian Agents' Cooperation Based on Long-Term Reciprocal Altruism. 689-698 2012 IEA/AIE https://doi.org/10.1007/978-3-642-31087-4_70 conf/ieaaie/2012 db/conf/ieaaie/ieaaie2012.html#ZhaoXYT12