Jingxuan Liu Yihan Huang Jialuoyi Tan Zhen Hua Enhancing document retrieval using semantic alignment with hierarchical graph matching. 2026 April 339 82 J. Supercomput. 5 https://doi.org/10.1007/s11227-026-08490-w db/journals/tjs/tjs82.html#LiuHTH26 streams/journals/tjs