Peter B. Vanderheyden Christopher A. Pennington An Augmentative Communication Interface Based on Conversational Schemata. 109-125 1998 conf/assistive/1998 Assistive Technology and Artificial Intelligence http://link.springer.de/link/service/series/0558/bibs/1458/14580109.htm db/conf/assistive/assistive1998.html#VanderheydenP98