Content-based Stance Classification of Tweets about the 2020 Italian Constitutional Referendum Marco Di Giovanni author Marco Brambilla author 2021-06 text Proceedings of the Ninth International Workshop on Natural Language Processing for Social Media Lun-Wei Ku editor Cheng-Te Li editor Association for Computational Linguistics Online conference publication di-giovanni-brambilla-2021-content 10.18653/v1/2021.socialnlp-1.2 https://aclanthology.org/2021.socialnlp-1.2/ 2021-06 14 23