Subtopic Annotation in a Corpus of News Texts: Steps Towards Automatic Subtopic Segmentation Paula C F Cardoso author Maite Taboada author Thiago A S Pardo author 2013 text Proceedings of the 9th Brazilian Symposium in Information and Human Language Technology conference publication cardoso-etal-2013-subtopic https://aclanthology.org/W13-4806/ 2013