Diane J. Litman Carolyn Penstein Rosé Katherine Forbes-Riley Kurt VanLehn Dumisizwe Bhembe Scott Silliman Spoken Versus Typed Human and Computer Dialogue Tutoring. 145-170 2006 16 I. J. Artificial Intelligence in Education 2 http://iospress.metapress.com/content/20venyb5u0tf4xcr/ db/journals/aiedu/aiedu16.html#LitmanRFVBS06