Labeling Gaps Between Words: Recognizing Overlapping Mentions with Mention Separators Aldrian Obaja Muis author Wei Lu author 2017-09 text Proceedings of the 2017 Conference on Empirical Methods in Natural Language Processing Martha Palmer editor Rebecca Hwa editor Sebastian Riedel editor Association for Computational Linguistics Copenhagen, Denmark conference publication muis-lu-2017-labeling 10.18653/v1/D17-1276 https://aclanthology.org/D17-1276/ 2017-09 2608 2618