Donna K. Byron Aakash Dalwani Ryan Gerritsen Mark A. Keck Thomas Mampilly Vinay Sharma Laura Stoia Timothy Weale Tianfang Xu Natural Noun Phrase Variation for Interactive Characters. 15-20 2005 conf/aiide/2005 AIIDE db/conf/aiide/aiide2005.html#ByronDGKMSSWX05