Lili Liu Dingwei Wang Shengxiang Yang An Immune System Based Genetic Algorithm Using Permutation-Based Dualism for Dynamic Traveling Salesman Problems. 725-734 2009 EvoWorkshops http://dx.doi.org/10.1007/978-3-642-01129-0_82 conf/evoW/2009 db/conf/evoW/evoW2009.html#LiuWY09