Never Abandon Minorities: Exhaustive Extraction of Bursty Phrases on Microblogs Using Set Cover Problem Masumi Shirakawa author Takahiro Hara author Takuya Maekawa 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 shirakawa-etal-2017-never 10.18653/v1/D17-1251 https://aclanthology.org/D17-1251/ 2017-09 2358 2367