Sieve-Based Spatial Relation Extraction with Expanding Parse Trees Jennifer D’Souza author Vincent Ng 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 dsouza-ng-2015-sieve 10.18653/v1/D15-1087 https://aclanthology.org/D15-1087/ 2015-09 758 768