A Bottom-Up Approach to Sentence Ordering for Multi-Document Summarization Danushka Bollegala author Naoaki Okazaki author Mitsuru Ishizuka author 2006-07 text Proceedings of the 21st International Conference on Computational Linguistics and 44th Annual Meeting of the Association for Computational Linguistics Nicoletta Calzolari editor Claire Cardie editor Pierre Isabelle editor Association for Computational Linguistics Sydney, Australia conference publication bollegala-etal-2006-bottom 10.3115/1220175.1220224 https://aclanthology.org/P06-1049/ 2006-07 385 392