Can we predict which groups of questions students will learn from. Feng, M., Heffernan, N., Beck, J., & Koedinger, K. In 2008. Citeseer.
bibtex   
@inproceedings{feng_can_2008,
	title = {Can we predict which groups of questions students will learn from},
	publisher = {Citeseer},
	author = {Feng, M. and Heffernan, N. and Beck, J. and Koedinger, K.},
	year = {2008}
}
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