Liang Zhou Chin-Yew Lin Dragos Stefan Munteanu Eduard H. Hovy ParaEval: Using Paraphrases to Evaluate Summaries Automatically. 2006 conf/naacl/2006 HLT-NAACL http://acl.ldc.upenn.edu/N/N06/N06-1057.pdf db/conf/naacl/naacl2006.html#ZhouLMH06