Automatic Expansion of Equivalent Sentence Set Based on Syntactic Substitution Kenji Imamura author Yasuhiro Akiba author Eiichiro Sumita author 2003 text Companion Volume of the Proceedings of HLT-NAACL 2003 - Short Papers conference publication imamura-etal-2003-automatic-expansion https://aclanthology.org/N03-2013/ 2003 37 39