Arthur C. Graesser Stan Franklin Peter M. Wiemer-Hastings Simulating Smooth Tutorial Dialogue with Pedagogical Value. 163-167 1998 conf/flairs/1998 FLAIRS Conference db/conf/flairs/flairs1998.html#GraesserFW98 http://www.aaai.org/Library/FLAIRS/1998/flairs98-031.php