J. Beck, K. Chang, J. Mostow, and A. Corbett. Intelligent Tutoring Systems, volume 5091 of Lecture Notes in Computer Science, Springer Berlin Heidelberg, (2008)
J. Beck, K. Chang, J. Mostow, and A. Corbett. Intelligent Tutoring Systems, volume 5091 of Lecture Notes in Computer Science, Springer Berlin Heidelberg, (2008)