Hongzhi Wang Jianzhong Li Xianmin Liu Jizhou Luo Query Optimization for Complex Path Queries on XML Data. 389-404 2009 DASFAA http://dx.doi.org/10.1007/978-3-642-00887-0_35 conf/dasfaa/2009 db/conf/dasfaa/dasfaa2009.html#WangLLL09