Hashtag Sense Clustering Based on Temporal Similarity Giovanni Stilo author Paola Velardi author 2017-04 text journal article Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal stilo-velardi-2017-hashtag 10.1162/COLI_a_00277 https://aclanthology.org/J17-1005/ 2017-04 43 1 181 200