Barbara Di Eugenio Davide Fossati Susan M. Haller Dan Yu Michael Glass Be Brief, And They Shall Learn: Generating Concise Language Feedback for a Computer Tutor. 317-345 2008 18 I. J. Artificial Intelligence in Education 4 http://iospress.metapress.com/content/323054631t056845/ db/journals/aiedu/aiedu18.html#EugenioFHYG08