00325nas a2200121   4500000000100000000000100001008004100002260003600043100001300079700001200092700001400104245008500118       2016                            d  c7-10 Aug. 2016 aHarbin, China 1 aMing Lei1 aQuanjun1 aXinyu Yao00aA method of encircle tactic based on geometric analysis in pursuit-evasion games