A Pilot Empirical Study on When and How to Use Knowledge Graphs as Retrieval Augmented Generation. - Xujie Yuan; Yongxu Liu 003; Shimin Di; Shiwen Wu; Libin Zheng 001; Rui Meng; Lei Chen 002; Xiaofang Zhou 001; Jian Yin 035 (DASFAA (4), 2026)