Wagster, J., H. Kwong, J. Sagedy, G. Biswas, and D. Shwartz,
"Bringing CBLEs into classrooms: Experiences with the Betty's Brain system",
The Eighth IEEE International Conference on Advanced Learning Technologies, Santander, Cantabria, Spain., pp. 252-256, 2008.
Jeong, H., A. Gupta, R. Roscoe, J. Wagster, G. Biswas, and D. Schwartz,
"Using hidden markov models to characterize student behaviors in learning-by-teaching environments",
In Intelligent Tutoring Systems: Vol. 5091. Lecture Notes in Computer Science, Montreal, Canada: Springer., pp. 614-625, 2008.