A Patent Document Retrieval System Addressing Both Semantic and Syntactic Properties Liang Chen author Naoyuki Tokuda author Hisahiro Adachi author 2003-07 text Proceedings of the ACL-2003 Workshop on Patent Corpus Processing Association for Computational Linguistics , conference publication chen-etal-2003-patent 10.3115/1119303.1119304 https://aclanthology.org/W03-2001/ 2003-07 1 6