Chris Brockett, William B. Dolan. Echo Chamber: A Game for Eliciting a Colloquial Paraphrase Corpus. In Knowledge Collection from Volunteer Contributors, Papers from the 2005 AAAI Spring Symposium, Technical Report SS-05-03, Stanford, California, USA, March 21-23, 2005. pages 8-15, AAAI, 2005. [doi]