Extractive Opinion Summarization in Quantized Transformer Spaces Stefanos Angelidis author Reinald Kim Amplayo author Yoshihiko Suhara author Xiaolan Wang author Mirella Lapata author 2021 text journal article Transactions of the Association for Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal angelidis-etal-2021-extractive 10.1162/tacl_a_00366 https://aclanthology.org/2021.tacl-1.17/ 2021 9 277 293