Significant Sentence Extraction by Euclidean Distance Based on Singular Value Decomposition Changbeom Lee author Hyukro Park author Cheolyoung Ock author 2005 text Second International Joint Conference on Natural Language Processing: Full Papers conference publication lee-etal-2005-significant 10.1007/11562214_56 https://aclanthology.org/I05-1056/ 2005