Key Concept Identification for Medical Information Retrieval Jiaping Zheng author Hong Yu author 2015-09 text Proceedings of the 2015 Conference on Empirical Methods in Natural Language Processing Lluís Màrquez editor Chris Callison-Burch editor Jian Su editor Association for Computational Linguistics Lisbon, Portugal conference publication zheng-yu-2015-key 10.18653/v1/D15-1069 https://aclanthology.org/D15-1069/ 2015-09 579 584