Multi-Paragraph Segmentation Expository Text Marti A Hearst author 1994-06 text 32nd Annual Meeting of the Association for Computational Linguistics Association for Computational Linguistics Las Cruces, New Mexico, USA conference publication hearst-1994-multi 10.3115/981732.981734 https://aclanthology.org/P94-1002/ 1994-06 9 16