@article {4433,
	title = {Using hidden markov models to characterize student behaviors in learning-by-teaching environments},
	year = {2008},
	pages = {614-625},
	address = {Montreal, Canada: Springer.},
	author = {H. Jeong and A. Gupta and R. Roscoe and J. Wagster and G. Biswas and D. Schwartz}
}
