Huaizhong Li Chiou Peng Lam An Ant Colony Optimization Approach to Test Sequence Generation for Statebased Software Testin. 255-264 2005 conf/eh/2005 QSIC http://doi.ieeecomputersociety.org/10.1109/QSIC.2005.12 db/conf/qsic/qsic2005.html#LiL05