A Machine Learning Approach to Sentence Ordering for Multidocument Summarization and Its Evaluation Danushka Bollegala author Naoaki Okazaki author Mitsuru Ishizuka author 2005 text Second International Joint Conference on Natural Language Processing: Full Papers conference publication bollegala-etal-2005-machine 10.1007/11562214_55 https://aclanthology.org/I05-1055/ 2005